glsl: move builtin vector types to glsl_types.cpp

glsl: move builtin vector types to glsl_types.cpp

First step at untangling NIR's dependency on glsl_types without bringing
in the dependency on glsl_symbol_table.  The builtin types are now in
glsl_types (which will end up in NIR), but adding them to the symbol-
table stays in builtin_types.cpp (which will not be part of NIR).

Reviewed-by: Jason Ekstrand <jason@jlekstrand.net>
Reviewed-by: Emil Velikov <emil.velikov@collabora.com>
Signed-off-by: Rob Clark <robclark@freedesktop.org>