crossgcc: Fix calling outside util/crossgcc

Copy $0 contains the path, and we cd into that early.

Change-Id: If4124d16dea97b5eee4996bdfa3eae3d5d94c5d1
Signed-off-by: Patrick Georgi <patrick@georgi-clan.de>
Reviewed-on: http://review.coreboot.org/9145
Tested-by: build bot (Jenkins)
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-by: Aaron Durbin <adurbin@google.com>
diff --git a/util/crossgcc/buildgcc b/util/crossgcc/buildgcc
index fde8bc6..8bcaf2f 100755
--- a/util/crossgcc/buildgcc
+++ b/util/crossgcc/buildgcc
@@ -614,8 +614,9 @@
 ) 2>&1 | wait_for_build "$IASL_DIR/source/compiler" || exit 1
 fi
 
-rm -f $DESTDIR$TARGETDIR/$0.commit.*
-cp $0 $DESTDIR$TARGETDIR/"$0.commit.`git describe`"
+PROGNAME=`basename "$0"`
+rm -f "$DESTDIR$TARGETDIR/$PROGNAME".commit.*
+cp "$PROGNAME" $DESTDIR$TARGETDIR/"$PROGNAME.commit.`git describe`"
 
 if [ $SAVETEMPS -eq 0 ]; then
 	printf "Cleaning up... "