egl: Add support for EGL_KHR_image.

Individual drivers still need to implement the API hooks.
diff --git a/src/egl/main/Makefile b/src/egl/main/Makefile
index 20614d8..5b83b43 100644
--- a/src/egl/main/Makefile
+++ b/src/egl/main/Makefile
@@ -19,6 +19,7 @@
 	egldisplay.h \
 	egldriver.h \
 	eglglobals.h \
+	eglimage.h \
 	egllog.h \
 	eglmisc.h \
 	eglmode.h \
@@ -36,6 +37,7 @@
 	egldisplay.c \
 	egldriver.c \
 	eglglobals.c \
+	eglimage.c \
 	egllog.c \
 	eglmisc.c \
 	eglmode.c \