Remove quotes in remaining bash regexes

After a8dcfeccfc, Allan noted that one more regular exprssion inside makepkg
also contained quotes; these should not be there for the same reason as that
commit.

Signed-off-by: Dan McGee <dan@archlinux.org>

scripts/makepkg.sh.in

@@ -1448,7 +1448,7 @@ parse_options() {
 		elif [[ ${1:0:1} = '-' ]]; then
 			for ((i=1; i<${#1}; i++)); do
 				if [[ $short_options =~ ${1:i:1} ]]; then
-					if [[ $short_options =~ "${1:i:1}:" ]]; then
+					if [[ $short_options =~ ${1:i:1}: ]]; then
 						if [[ -n ${1:$i+1} ]]; then
 							printf ' -%s' "${1:i:1}"
 							printf " '%s'" "${1:$i+1}"