misc/rmlint: Fix multiple jobs configuration.

scons takes a jobs argument (either --jobs=N or -jN) but will fail
if MAKEFLAGS has other values in it.

This change mirrors how it is done in pybik.SlackBuild.

Signed-off-by: Andrew Clemons <andrew.clemons@gmail.com>

Signed-off-by: Willy Sudiarto Raharjo <willysr@slackbuilds.org>

misc/rmlint/rmlint.SlackBuild

@@ -81,7 +81,15 @@ find -L . \
   -o -perm 440 -o -perm 400 \) -exec chmod 644 {} \;
 
 scons config CXXFLAGS="$SLKCFLAGS"
-scons "$MAKEFLAGS" CXXFLAGS="$SLKCFLAGS" 
+
+# scons can use multiple jobs. For convenience, read MAKEFLAGS from the environment, if set
+JOBS="$( echo $MAKEFLAGS | sed 's,.*-j *\([0-9][0-9]*\)*.*,\1,' )"
+# or if no MAKEFLAGS, use the number of cores minus 1
+JOBS="${JOBS:-$(( $( nproc ) - 1 ))}"
+# or 1, if we really have one core
+[ "$JOBS" = "0" ] && JOBS=1
+
+scons --jobs="$JOBS" CXXFLAGS="$SLKCFLAGS" 
 scons --prefix=${PKG}/usr install
 
 rm -f $PKG/{,usr/}lib${LIBDIRSUFFIX}/*.la