Revert "mesa: Enable asm unconditionally, now that gen_matypes is gone."
This reverts commit 20294dce.
This breaks my chromeos android build.
src/mapi/shared-glapi/e4b98b6@@glapi@sha/.._entry.c.o(.text+0xe): error: undefined reference to '_glapi_tls_Dispatch'
while building src/mapi/shared-glapi/libglapi.so.0.0.0
I don't know enough of glapi to fix this so hence I propose this revert.