(uninstall): Don't set OBJDUMP and OBJDUMPFLAGS in site.exp.
* config/default.exp: Default OBJDUMP and OBJDUMPFLAGS. Use findfile and
transform procedures to determine objdump program name.
* Makefile.in (site.exp): Don't set ASFLAGS. Quote value of OBJDUMPFLAGS in
case it's empty. Use temporary names until the end; make creating site.exp the
final step.
(check): Pass in ASFLAGS.
* gas/all/gas.exp: Use all_ones proc. Change regexp for matching
C comments to avoid bugs in latest expect code.