Added missing headers that should be installed.
diff --git a/Makefile.in b/Makefile.in
index a330831..65f3b72 100644
--- a/Makefile.in
+++ b/Makefile.in
@@ -47,10 +47,11 @@ HDRS = \
SDL_assert.h \
SDL_atomic.h \
SDL_audio.h \
- SDL_bits.h \
+ SDL_bits.h \
SDL_blendmode.h \
SDL_clipboard.h \
SDL_cpuinfo.h \
+ SDL_egl.h \
SDL_endian.h \
SDL_error.h \
SDL_events.h \
@@ -72,7 +73,11 @@ HDRS = \
SDL_opengl.h \
SDL_opengl_glext.h \
SDL_opengles.h \
+ SDL_opengles2_gl2ext.h \
+ SDL_opengles2_gl2.h \
+ SDL_opengles2_gl2platform.h \
SDL_opengles2.h \
+ SDL_opengles2_khrplatform.h \
SDL_pixels.h \
SDL_platform.h \
SDL_power.h \