cosmetic: Move WL_EXPORT out of header files

Most of the code only puts WL_EXPORT in .c files.  Remove the few
instances in header files.

If it's missing form the associated .c, put it there instead.

src/compositor.h

@@ -963,10 +963,10 @@ weston_view_from_global_fixed(struct weston_view *view,
 			      wl_fixed_t x, wl_fixed_t y,
 			      wl_fixed_t *vx, wl_fixed_t *vy);
 
-WL_EXPORT void
+void
 weston_surface_to_buffer_float(struct weston_surface *surface,
 			       float x, float y, float *bx, float *by);
-WL_EXPORT void
+void
 weston_surface_to_buffer(struct weston_surface *surface,
 			 int sx, int sy, int *bx, int *by);
 pixman_box32_t
@@ -1196,7 +1196,7 @@ weston_view_schedule_repaint(struct weston_view *view);
 int
 weston_surface_is_mapped(struct weston_surface *surface);
 
-WL_EXPORT void
+void
 weston_surface_set_size(struct weston_surface *surface,
 			int32_t width, int32_t height);
 

src/filter.c

@@ -32,7 +32,7 @@
 #include "compositor.h"
 #include "filter.h"
 
-void
+WL_EXPORT void
 weston_filter_dispatch(struct weston_motion_filter *filter,
 		       struct weston_motion_params *motion,
 		       void *data, uint32_t time)
@@ -313,7 +313,7 @@ struct weston_motion_filter_interface accelerator_interface = {
 	accelerator_destroy
 };
 
-struct weston_motion_filter *
+WL_EXPORT struct weston_motion_filter *
 create_pointer_accelator_filter(accel_profile_func_t profile)
 {
 	struct pointer_accelerator *filter;

src/filter.h

@@ -35,7 +35,7 @@ struct weston_motion_params {
 
 struct weston_motion_filter;
 
-WL_EXPORT void
+void
 weston_filter_dispatch(struct weston_motion_filter *filter,
 		       struct weston_motion_params *motion,
 		       void *data, uint32_t time);
@@ -57,7 +57,7 @@ typedef double (*accel_profile_func_t)(struct weston_motion_filter *filter,
 				       double velocity,
 				       uint32_t time);
 
-WL_EXPORT struct weston_motion_filter *
+struct weston_motion_filter *
 create_pointer_accelator_filter(accel_profile_func_t filter);
 
 #endif // _FILTER_H_