Put the callspec after the return type for MSVC.

Visual Studio does not like __stdcall before the return type, which is
what GLAPIENTRY and EPOXY_CALLSPEC expands to on Windows.

src/dispatch_common.c

@@ -674,7 +674,7 @@ epoxy_print_failure_reasons(const char *name,
     }
 }
 
-WRAPPER_VISIBILITY void
+WRAPPER_VISIBILITY (void)
 WRAPPER(epoxy_glBegin)(GLenum primtype)
 {
 #ifdef _WIN32
@@ -688,7 +688,7 @@ WRAPPER(epoxy_glBegin)(GLenum primtype)
     epoxy_glBegin_unwrapped(primtype);
 }
 
-WRAPPER_VISIBILITY void
+WRAPPER_VISIBILITY (void)
 WRAPPER(epoxy_glEnd)(void)
 {
     epoxy_glEnd_unwrapped();

src/dispatch_common.h

@@ -77,11 +77,11 @@
 #endif
 
 #define UNWRAPPED_PROTO(x) (GLAPIENTRY *x)
-#define WRAPPER_VISIBILITY static GLAPIENTRY
+#define WRAPPER_VISIBILITY(type) static type GLAPIENTRY
 #define WRAPPER(x) x ## _wrapped
 
 #define GEN_GLOBAL_REWRITE_PTR(name, args, passthrough)          \
-    static EPOXY_CALLSPEC void                                        \
+    static void EPOXY_CALLSPEC                                        \
     name##_global_rewrite_ptr args                               \
     {                                                            \
         name = (void *)name##_resolver();                        \
@@ -89,7 +89,7 @@
     }
 
 #define GEN_GLOBAL_REWRITE_PTR_RET(ret, name, args, passthrough) \
-    static EPOXY_CALLSPEC ret                                    \
+    static ret EPOXY_CALLSPEC                                    \
     name##_global_rewrite_ptr args                               \
     {                                                            \
         name = (void *)name##_resolver();                        \
@@ -98,7 +98,7 @@
 
 #if USING_DISPATCH_TABLE
 #define GEN_DISPATCH_TABLE_REWRITE_PTR(name, args, passthrough)            \
-    static EPOXY_CALLSPEC void                                             \
+    static void EPOXY_CALLSPEC                                             \
     name##_dispatch_table_rewrite_ptr args                                 \
     {                                                                      \
         struct dispatch_table *dispatch_table = get_dispatch_table();      \
@@ -108,7 +108,7 @@
     }
 
 #define GEN_DISPATCH_TABLE_REWRITE_PTR_RET(ret, name, args, passthrough)   \
-    static EPOXY_CALLSPEC ret                                              \
+    static ret EPOXY_CALLSPEC                                              \
     name##_dispatch_table_rewrite_ptr args                                 \
     {                                                                      \
         struct dispatch_table *dispatch_table = get_dispatch_table();      \
@@ -118,14 +118,14 @@
     }
 
 #define GEN_DISPATCH_TABLE_THUNK(name, args, passthrough)                  \
-    static EPOXY_CALLSPEC void                                             \
+    static void EPOXY_CALLSPEC                                             \
     name##_dispatch_table_thunk args                                       \
     {                                                                      \
         get_dispatch_table()->name passthrough;                            \
     }
 
 #define GEN_DISPATCH_TABLE_THUNK_RET(ret, name, args, passthrough)         \
-    static EPOXY_CALLSPEC ret                                              \
+    static ret EPOXY_CALLSPEC                                              \
     name##_dispatch_table_thunk args                                       \
     {                                                                      \
         return get_dispatch_table()->name passthrough;                     \

src/dispatch_wgl.c

@@ -141,7 +141,7 @@ DllMain(HINSTANCE dll, DWORD reason, LPVOID reserved)
     return TRUE;
 }
 
-WRAPPER_VISIBILITY BOOL
+WRAPPER_VISIBILITY (BOOL)
 WRAPPER(epoxy_wglMakeCurrent)(HDC hdc, HGLRC hglrc)
 {
     BOOL ret = epoxy_wglMakeCurrent_unwrapped(hdc, hglrc);
@@ -152,7 +152,7 @@ WRAPPER(epoxy_wglMakeCurrent)(HDC hdc, HGLRC hglrc)
 }
 
 
-WRAPPER_VISIBILITY BOOL
+WRAPPER_VISIBILITY (BOOL)
 WRAPPER(epoxy_wglMakeContextCurrentARB)(HDC hDrawDC,
                                         HDC hReadDC,
                                         HGLRC hglrc)
@@ -166,7 +166,7 @@ WRAPPER(epoxy_wglMakeContextCurrentARB)(HDC hDrawDC,
 }
 
 
-WRAPPER_VISIBILITY BOOL
+WRAPPER_VISIBILITY (BOOL)
 WRAPPER(epoxy_wglMakeContextCurrentEXT)(HDC hDrawDC,
                                         HDC hReadDC,
                                         HGLRC hglrc)
@@ -180,7 +180,7 @@ WRAPPER(epoxy_wglMakeContextCurrentEXT)(HDC hDrawDC,
 }
 
 
-WRAPPER_VISIBILITY BOOL
+WRAPPER_VISIBILITY (BOOL)
 WRAPPER(epoxy_wglMakeAssociatedContextCurrentAMD)(HGLRC hglrc)
 {
     BOOL ret = epoxy_wglMakeAssociatedContextCurrentAMD_unwrapped(hglrc);