Contribs: Use $STRIP

And don't ignore errors
(cherry picked from commit 17a09405)
Signed-off-by: Rémi Denis-Courmont <remi@remlab.net>

extras/contrib/src/Makefile

@@ -658,12 +658,12 @@ lua: lua-$(LUA_VERSION).tar.gz
 
 .lua: lua
 ifdef HAVE_WIN32
-	( cd $<; sed -i.orig 's/lua luac/lua.exe/' Makefile ; cd src; sed -i.orig 's/CC=/#CC=/' Makefile; cd ../..;)
-	(cd $<; $(HOSTCC) make $(LUA_MAKEPLATEFORM); cd src; $(HOSTCC) make liblua.a; cd ..;$(HOSTCC) make install INSTALL_TOP=$(PREFIX); $(RANLIB) $(PREFIX)/lib/liblua.a)
-	(cd $<; sed -i.orig 's@prefix= /usr/local@prefix= $(PREFIX)@' etc/lua.pc; mkdir -p $(PREFIX)/lib/pkgconfig; cp etc/lua.pc $(PREFIX)/lib/pkgconfig)
+	( cd $< && sed -i.orig 's/lua luac/lua.exe/' Makefile && cd src && sed -i.orig 's/CC=/#CC=/' Makefile && sed -i 's/strip/\$(STRIP)/' Makefile && cd ../..)
+	(cd $<&& $(HOSTCC) make $(LUA_MAKEPLATEFORM)&& cd src&& $(HOSTCC) make liblua.a&& cd ..&&$(HOSTCC) make install INSTALL_TOP=$(PREFIX)&& $(RANLIB) $(PREFIX)/lib/liblua.a)
+	(cd $<&& sed -i.orig 's@prefix= /usr/local@prefix= $(PREFIX)@' etc/lua.pc&& mkdir -p $(PREFIX)/lib/pkgconfig&& cp etc/lua.pc $(PREFIX)/lib/pkgconfig)
 else
-	(cd $<; patch -p1) < Patches/lua-noreadline.patch
-	(cd $<; $(HOSTCC) make $(LUA_MAKEPLATEFORM) && make install INSTALL_TOP=$(PREFIX))
+	(cd $<&& patch -p1) < Patches/lua-noreadline.patch
+	(cd $<&& $(HOSTCC) make $(LUA_MAKEPLATEFORM) && make install INSTALL_TOP=$(PREFIX))
 endif
 	touch $@