Fix the behavior of glx_shared_znow if it doesn't die at startup.

We're sharing the source file with glx_static, but we don't want to
SKIP due to not being statically linked.

test/Makefile.am

@@ -107,6 +107,7 @@ glx_glxgetprocaddress_nocontext_DEPENDENCIES = $(EPOXY) libglx_common.la
 glx_has_extension_nocontext_LDFLAGS = $(X11_LIBS) $(EPOXY) libglx_common.la
 glx_has_extension_nocontext_DEPENDENCIES = $(EPOXY) libglx_common.la
 
+glx_static_CFLAGS = -DNEEDS_TO_BE_STATIC
 glx_static_LDFLAGS = -ldl $(X11_LIBS) -static $(EPOXY) libglx_common.la
 glx_static_DEPENDENCIES = $(EPOXY) libglx_common.la
 

test/glx_static.c

@@ -48,10 +48,12 @@ main(int argc, char **argv)
     bool pass = true;
     int val;
 
+#if NEEDS_TO_BE_STATIC
     if (dlsym(NULL, "epoxy_glCompileShader")) {
         fprintf(stderr, "glx_static requires epoxy built with --enable-static\n");
         return 77;
     }
+#endif
 
     Display *dpy = get_display_or_skip();
     make_glx_context_current_or_skip(dpy);