xcompile: Force localization of objdump to C

In testing other localization changes, I found that I couldn't build
anymore because xcompile wasn't picking up my toolchain.  I traced it
to the regex comparison of '.*format \(.[a-z0-9-]*\)' to the string
'formato del fichero elf32-i386'.  Forcing the localization of
objdump to C before doing the comparison fixes the issue.

Change-Id: I6bed5a9824807dd5bc5a38b711ab47e2af4b0c29
Signed-off-by: Martin Roth <martinroth@google.com>
Reviewed-on: http://review.coreboot.org/11304
Tested-by: build bot (Jenkins)
Reviewed-by: Patrick Georgi <pgeorgi@google.com>
Reviewed-by: Zheng Bao <zheng.bao@amd.com>

util/xcompile/xcompile

@@ -103,7 +103,7 @@ testas() {
 		2>/dev/null || return 1
 
 	# Check output content type.
-	local obj_type="$(${gccprefix}objdump -p $obj_file)"
+	local obj_type="$(LANG=C LC_ALL= ${gccprefix}objdump -p $obj_file)"
 	local obj_arch="$(expr "$obj_type" : '.*format \(.[a-z0-9-]*\)')"
 	[ "$obj_arch" = "$full_arch" ] || return 1