Handle descriptions in optdepends array

The packages in optdepends can have descriptions appended which need to
be reomved by parsepkgbuild.
e.g. optdepends=('foo: for bar functionality')

Signed-off-by: Allan McRae <allan@archlinux.org>

parsepkgbuild

@@ -61,7 +61,7 @@ if [ -n "\$makedepends" ]; then
 fi
 if [ -n "\$optdepends" ]; then
 	echo "%OPTDEPENDS%"
-	for i in \${optdepends[@]}; do echo \$i; done
+	for i in \${!optdepends[*]}; do echo \${optdepends[\$i]%:*}; done
 	echo ""
 fi
 if [ -n "\$conflicts" ]; then