genCommon.py: Fix typo in _LIBRARY_FEATURE_NAMES.

Port glvnd commit 37fc6caa4b ("Fix typo in _LIBRARY_FEATURE_NAMES.")
from Michal Srb.

Signed-off-by: Emil Velikov <emil.velikov@collabora.com>
Reviewed-by: Erik Faye-Lund <erik.faye-lund@collabora.com>

src/egl/generate/genCommon.py

     )),
     "glesv1" : frozenset(("GL_VERSION_ES_CM_1_0", "GL_OES_point_size_array")),
     "glesv2" : frozenset(("GL_ES_VERSION_2_0", "GL_ES_VERSION_3_0",
-            "GL_ES_VERSION_3_1" "GL_ES_VERSION_3_2",
+            "GL_ES_VERSION_3_1", "GL_ES_VERSION_3_2",
     )),
 }