mesa/vbo: Check for invalid types in various packed vertex functions.

mesa/vbo: Check for invalid types in various packed vertex functions.

According to the ARB_vertex_type_2_10_10_10_rev specification:
"The error INVALID_ENUM is generated by VertexP*, NormalP*,
 TexCoordP*, MultiTexCoordP*, ColorP*, or SecondaryColorP if <type>
 is not UNSIGNED_INT_2_10_10_10_REV or INT_2_10_10_10_REV."

Fixes 7 subcases of oglconform's packed-vertex test.

v2: Add "gl" prefix to error messages (pointed out by Brian).
    Also rebase atop the ctx plumbing.

Reviewed-by: Brian Paul <brianp@vmware.com>