build: Change HAVE_X86_ASM to mean x86 or x86-64 asm.

I want a conditional that says generally "we have x86 assembly" in the
next patch.

Reviewed-by: Eric Anholt <eric@anholt.net>
diff --git a/configure.ac b/configure.ac
index 6590583..0896d85 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1938,7 +1938,7 @@
 AM_CONDITIONAL(HAVE_OSMESA, test "x$enable_osmesa" = xyes)
 AM_CONDITIONAL(HAVE_GALLIUM_OSMESA, test "x$enable_gallium_osmesa" = xyes)
 
-AM_CONDITIONAL(HAVE_X86_ASM, test "x$asm_arch" = xx86)
+AM_CONDITIONAL(HAVE_X86_ASM, test "x$asm_arch" = xx86 -o "x$asm_arch" = xx86_64)
 AM_CONDITIONAL(HAVE_X86_64_ASM, test "x$asm_arch" = xx86_64)
 AM_CONDITIONAL(HAVE_SPARC_ASM, test "x$asm_arch" = xsparc)