xfig: Harden multiprocessor build

With 12 cores building is ok, with ~60 not always.
mariux64 · thomas · Sep 20, 2019 · Sep 19, 2019 · Sep 20, 2019 · Sep 20, 2019
commit 765a5082c3b527076d7d6f265fca88d6f14272ad
diff --git a/xfig-3.2.7-0.build.sh b/xfig-3.2.7-0.build.sh
@@ -62,7 +62,7 @@ cd $BUILDDIR
 		RPATH = -Wl,-rpath=$PREFIX/lib
 EOF
 
-  make
+  make || make -j1
   PKGDIR=$(pwd)/pkg
   make package pkgdir=$PKGDIR
   ./installnetpbm <<EOF