gl: deploy egl headers in gst/gl/egl instead of gst/gl

https://bugzilla.gnome.org/show_bug.cgi?id=703343

configure.ac

@@ -3183,6 +3183,7 @@ gst-libs/gst/gl/android/Makefile
 gst-libs/gst/gl/cocoa/Makefile
 gst-libs/gst/gl/dispmanx/Makefile
 gst-libs/gst/gl/glprototypes/Makefile
+gst-libs/gst/gl/egl/Makefile
 gst-libs/gst/gl/wayland/Makefile
 gst-libs/gst/gl/win32/Makefile
 gst-libs/gst/gl/x11/Makefile

gst-libs/gst/gl/Makefile.am

@@ -86,11 +86,8 @@ libgstgl_@GST_API_VERSION@_la_LIBADD += android/libgstgl-android.la
 endif
 
 if USE_EGL
-libgstgl_@GST_API_VERSION@_la_SOURCES += egl/gstglcontext_egl.c \
-	egl/gstgldisplay_egl.c
-libgstgl_@GST_API_VERSION@_la_LIBADD += $(top_builddir)/gst-libs/gst/egl/libgstegl-$(GST_API_VERSION).la
-libgstgl_@GST_API_VERSION@include_HEADERS += egl/gstgldisplay_egl.h
-noinst_HEADERS += egl/gstglcontext_egl.h
+SUBDIRS += egl
+libgstgl_@GST_API_VERSION@_la_LIBADD += egl/libgstgl-egl.la
 endif
 
 nodist_libgstgl_@GST_API_VERSION@include_HEADERS = \

gst-libs/gst/gl/egl/Makefile.am

@@ -0,0 +1,27 @@
+## Process this file with automake to produce Makefile.in
+
+noinst_LTLIBRARIES = libgstgl-egl.la
+
+libgstgl_egl_la_SOURCES = \
+	gstgldisplay_egl.c \
+	gstglcontext_egl.c
+
+noinst_HEADERS = \
+	gstglcontext_egl.h
+
+libgstgl_eglincludedir = $(includedir)/gstreamer-@GST_API_VERSION@/gst/gl/egl
+libgstgl_eglinclude_HEADERS = \
+	gstgldisplay_egl.h
+
+libgstgl_egl_la_LIBADD = $(top_builddir)/gst-libs/gst/egl/libgstegl-$(GST_API_VERSION).la
+
+libgstgl_egl_la_CFLAGS = \
+	-I$(top_srcdir)/gst-libs \
+	$(GL_CFLAGS) \
+	$(GST_PLUGINS_BASE_CFLAGS) \
+	$(GST_BASE_CFLAGS) \
+	$(GST_CFLAGS)
+
+libgstgl_egl_la_LDFLAGS = \
+	$(GST_LIB_LDFLAGS) \
+	$(GST_ALL_LDFLAGS)