mesa: Fix remap_table setup.

mesa: Fix remap_table setup.

Since the SET_xxx and GET_xxx macros used to initialize the remap_table
have been replaced by inline functions, the missing late macro expansion
leads to driDispatchRemapTable not being redefined to remap_table, which
in turn causes the remap_table not to be setup properly.

This commit fixes the issue by moving the table redefinition after the
definition of driDispatchRemapTable but in front of the inline function
definitions.