rhi: gl: Skip useless glEnable for point sprites in core profiles

Might fail with invalid enum in core profile contexts. The behavior
is the same regardless.

Pick-to: 6.5 6.2
Fixes: QTBUG-113289
Change-Id: I5e5764494be3c5f37537f5f9b3b5311d9c49def4
Reviewed-by: Giuseppe D'Angelo <giuseppe.dangelo@kdab.com>

src/gui/rhi/qrhigles2.cpp

@@ -956,6 +956,7 @@ bool QRhiGles2::create(QRhi::Flags flags)
 
     if (!caps.gles) {
         f->glEnable(GL_VERTEX_PROGRAM_POINT_SIZE);
+        if (!caps.coreProfile)
             f->glEnable(GL_POINT_SPRITE);
     } // else (with gles) these are always on