Install the GL/GLES/GLX/EGL header files.

Since we've got pkg-config files for the various libraries, we should also
install the corresponding header files so that the include directory matches
up.

include/Makefile.am

@@ -9,17 +9,57 @@ noinst_HEADERS = \
 	compiler.h \
 	glheader.h \
 	glvnd_list.h \
-	lkdhash.h \
-	EGL/egl.h \
-	EGL/eglext.h \
-	EGL/eglplatform.h \
+	lkdhash.h
+
+GL_HEADER_FILES = \
 	GL/gl.h \
+	GL/glcorearb.h \
 	GL/glext.h \
-	GL/glx.h \
-	GL/glxext.h \
+	KHR/khrplatform.h
+
+GLES_HEADER_FILES = \
 	GLES/egl.h \
 	GLES/gl.h \
 	GLES/glext.h \
 	GLES/glplatform.h \
-	KHR/khrplatform.h
+	GLES2/gl2ext.h \
+	GLES2/gl2.h \
+	GLES2/gl2platform.h \
+	GLES3/gl31.h \
+	GLES3/gl32.h \
+	GLES3/gl3.h \
+	GLES3/gl3platform.h
+
+GLX_HEADER_FILES = \
+	GL/glx.h \
+	GL/glxext.h
+
+EGL_HEADER_FILES = \
+	EGL/egl.h \
+	EGL/eglext.h \
+	EGL/eglplatform.h
+
+if ENABLE_EGL
+nobase_include_HEADERS += $(GL_HEADER_FILES)
+else
+noinst_HEADERS += $(GL_HEADER_FILES)
+endif
+
+if ENABLE_GLES
+nobase_include_HEADERS += $(GLES_HEADER_FILES)
+else
+noinst_HEADERS += $(GLES_HEADER_FILES)
+endif
+
+if ENABLE_GLX
+nobase_include_HEADERS += $(GLX_HEADER_FILES)
+else
+noinst_HEADERS += $(GLX_HEADER_FILES)
+endif
+
+if ENABLE_EGL
+nobase_include_HEADERS += $(EGL_HEADER_FILES)
+else
+noinst_HEADERS += $(EGL_HEADER_FILES)
+endif