newapkbuild: add command line flag for cmake to getopts

It is documented in the help output but didn't work because getopts(1)
didn't check for that option. I am assuming the person who added cmake
support simply forgot to adjust the getopts line.

newapkbuild.in

@@ -337,7 +337,7 @@ usage() {
 	__EOF__
 }
 
-while getopts "acmd:fhl:n:pyu:s" opt; do
+while getopts "acCmd:fhl:n:pyu:s" opt; do
 	case $opt in
 		'a') buildtype="autotools";;
 		'c') cpinitd=1;;