[GLES2] Don't proxy glTexEnvf on GLES2, even if the function exists
[GLES2] Don't proxy glTexEnvf on GLES2, even if the function exists

ptitSeb/gl4es,ptitSeb/gl4es,ptitSeb/glshim,ptitSeb/glshim,ptitSeb/gl4es,ptitSeb/glshim,ptitSeb/gl4es,ptitSeb/glshim