[gvar] Don't expand glyph for unused pointCount

Keep it in the API though.

Lib/fontTools/ttLib/tables/TupleVariation.py

@@ -632,6 +632,8 @@ def compileSharedTuples(axisTags, variations,
 def compileTupleVariationStore(variations, pointCount,
                                axisTags, sharedTupleIndices,
                                useSharedPoints=True):
+	# pointCount is actually unused. Keeping for API compat.
+	del pointCount
 	newVariations = []
 	pointDatas = []
 	# Compile all points and figure out sharing if desired

Lib/fontTools/ttLib/tables/_g_v_a_r.py

@@ -99,9 +99,8 @@ class table__g_v_a_r(DefaultTable.DefaultTable):
 			if not variations:
 				result.append(b"")
 				continue
-			glyph = glyf[glyphName]
-			pointCount = self.getNumPoints_(glyph)
-			result.append(compileGlyph_(variations, pointCount,
+			pointCountUnused = 0 # pointCount is actually unused by compileGlyph
+			result.append(compileGlyph_(variations, pointCountUnused,
 			                            axisTags, sharedCoordIndices))
 		return result