desktop/i3blocks: Force a single job during "make install".

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

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

desktop/i3blocks/i3blocks.SlackBuild

@@ -93,7 +93,7 @@ CXXFLAGS="$SLKCFLAGS" \
   --build=$ARCH-slackware-linux
 
 make
-make install DESTDIR=$PKG
+make -j1 install DESTDIR=$PKG
 
 find $PKG -print0 | xargs -0 file | grep -e "executable" -e "shared object" | grep ELF \
   | cut -f 1 -d : | xargs strip --strip-unneeded 2> /dev/null || true