mesa: fix incomplete GL_NV_half_float implementation
All of the VertexAttrib* functions were missing.
Fixes: ef66e02a ("src/mesa: add GL_NV_half_float extension support (v2)")
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All of the VertexAttrib* functions were missing.
Fixes: ef66e02a ("src/mesa: add GL_NV_half_float extension support (v2)")