Fix compilation on ppc64 and ppc with pic if gas-preprocessor is installed.

configure

@@ -4279,7 +4279,7 @@ EOF
 od -t x1 $TMPO | grep -q '42 *49 *47 *45' && enable bigendian
 
 
-if enabled asm; then
+if enabled asm && ! enabled_any ppc64 pic; then
     enabled     arm         && nogas=die
     enabled_all ppc altivec && nogas=warn
     as=${gas:=$as}