games/ultimatestunts: Use a single make job.

Signed-off-by: Matteo Bernardini <ponce@slackbuilds.org>

games/ultimatestunts/ultimatestunts.SlackBuild

@@ -2,7 +2,7 @@
 
 # Slackware build script for ultimatestunts
 
-# Copyright 2018 - 2020  Johannes Schoepfer, Germany
+# Copyright 2018 - 2022  Johannes Schoepfer, Germany
 # All rights reserved.
 #
 # Redistribution and use of this script, with or without modification, is
@@ -39,9 +39,6 @@ if [ -z "$ARCH" ]; then
   esac
 fi
 
-# If the variable PRINT_PACKAGE_NAME is set, then this script will report what
-# the name of the created package would be, and then exit. This information
-# could be useful to other scripts.
 if [ ! -z "${PRINT_PACKAGE_NAME}" ]; then
   echo "$PRGNAM-$VERSION-$ARCH-$BUILD$TAG.$PKGTYPE"
   exit 0
@@ -89,7 +86,7 @@ CXXFLAGS="$SLKCFLAGS" \
   --sysconfdir=/etc \
   --build=$ARCH-slackware-linux
 
-make
+make -j1
 make sysconfdir=$PKG/etc prefix=$PKG/usr install
 mv $PKG/etc/$PRGNAM.conf $PKG/etc/$PRGNAM.conf.new