modules: updated FindOpenGLES[23].cmake to work on iOS.

modules/FindOpenGLES2.cmake

@@ -37,14 +37,24 @@
 if(NOT CORRADE_TARGET_EMSCRIPTEN)
     find_library(OPENGLES2_LIBRARY NAMES
         GLESv2
-        libGLESv2 # ANGLE (CMake doesn't search for lib prefix on Windows)
-        ppapi_gles2) # NaCl
+
+        # ANGLE (CMake doesn't search for lib prefix on Windows)
+        libGLESv2
+
+        # iOS
+        OpenGLES
+
+        # NaCl
+        ppapi_gles2)
     set(OPENGLES2_LIBRARY_NEEDED OPENGLES2_LIBRARY)
 endif()
 
 # Include dir
-find_path(OPENGLES2_INCLUDE_DIR
-    NAMES GLES2/gl2.h)
+find_path(OPENGLES2_INCLUDE_DIR NAMES
+    GLES2/gl2.h
+
+    # iOS
+    ES2/gl.h)
 
 include(FindPackageHandleStandardArgs)
 find_package_handle_standard_args("OpenGLES2" DEFAULT_MSG

modules/FindOpenGLES3.cmake

@@ -42,13 +42,20 @@ if(NOT CORRADE_TARGET_EMSCRIPTEN)
         # support is provided in ES2 lib
         GLESv2
 
-        libGLESv2) # ANGLE (CMake doesn't search for lib prefix on Windows)
+        # ANGLE (CMake doesn't search for lib prefix on Windows)
+        libGLESv2
+
+        # iOS
+        OpenGLES)
     set(OPENGLES3_LIBRARY_NEEDED OPENGLES3_LIBRARY)
 endif()
 
 # Include dir
-find_path(OPENGLES3_INCLUDE_DIR
-    NAMES GLES3/gl3.h)
+find_path(OPENGLES3_INCLUDE_DIR NAMES
+    GLES3/gl3.h
+
+    # iOS
+    ES3/gl.h)
 
 include(FindPackageHandleStandardArgs)
 find_package_handle_standard_args("OpenGLES3" DEFAULT_MSG