use GLESv2 instead of GL

recipes-core/images/core-image-minimal.bbappend

@@ -20,7 +20,6 @@ IMAGE_INSTALL:append = "libcurl \
                         libgles2 \
                         libegl-mesa \
                         libgl-mesa \
-                        mesa-gl \
                         libglapi \
                         libudev \
                         udev \

recipes-example/example/example_0.1.bb

@@ -12,8 +12,8 @@ TARGET_CC_ARCH += "${LDFLAGS}"
 
 do_compile() {
     ${CXX} ${WORKDIR}/sdl_test.cpp `pkg-config --cflags --libs sdl2` -o ${WORKDIR}/sdl_test
-    ${CC} ${WORKDIR}/sdlgl.c `pkg-config --cflags --libs sdl2` -lGL -o ${WORKDIR}/sdlgl
-    ${CC} ${WORKDIR}/sdlglshader.c `pkg-config --cflags --libs sdl2` -lGL -o ${WORKDIR}/sdlglshader
+    ${CC} ${WORKDIR}/sdlgl.c `pkg-config --cflags --libs sdl2` -lGLESv2 -o ${WORKDIR}/sdlgl
+    ${CC} ${WORKDIR}/sdlglshader.c `pkg-config --cflags --libs sdl2` -lGLESv2 -o ${WORKDIR}/sdlglshader
 }
 
 do_install() {

recipes-example/example/files/sdlgl.c

@@ -8,7 +8,7 @@
 #include <assert.h>
 #include <SDL2/SDL.h>
 #include <SDL2/SDL_opengl.h>
-#include <GL/gl.h>
+#include <GLES/gl.h>
 
 typedef int32_t i32;
 typedef uint32_t u32;

recipes-example/example/files/sdlglshader.c

@@ -8,7 +8,7 @@
 #include <assert.h>
 #include <SDL2/SDL.h>
 #include <SDL2/SDL_opengl.h>
-#include <GL/gl.h>
+#include <GLES/gl.h>
 
 typedef int32_t i32;
 typedef uint32_t u32;