Added a couple of fixes for glext.h and wglext.h dependencies.

CMake/ExternalGLExt.cmake

@@ -7,5 +7,5 @@ IF(NOT EXISTS ${POLYCODE_DEPS_DOWNLOAD_DIR}/glext.h)
         SHOW_PROGRESS)
 ENDIF()
 
-ADD_CUSTOM_TARGET(wglext
+ADD_CUSTOM_TARGET(glext
     COMMAND ${CMAKE_COMMAND} -E copy_if_different ${POLYCODE_DEPS_DOWNLOAD_DIR}/glext.h ${POLYCODE_DEPS_CORE_PREFIX}/include/GL/glext.h)

Dependencies/CMakeLists.txt

@@ -178,3 +178,7 @@ ENDIF(POLYCODE_DEPS_ASSIMP)
 IF(POLYCODE_DEPS_GLEXT)
     INCLUDE(ExternalGLExt)
 ENDIF(POLYCODE_DEPS_GLEXT)
+
+IF(POLYCODE_DEPS_WGLEXT)
+    INCLUDE(ExternalWGLExt)
+ENDIF(POLYCODE_DEPS_WGLEXT)