Merge pull request luigirizzo#839 from badagent/modpost-fix-make-inst…

…all-debian-bullseye

Fixes ERROR: modpost errors when running make install on Debian Bullseye

LINUX/default-config.mak.in_

@@ -63,7 +63,7 @@ $(1)@fetch	:= test -e @SRCDIR@/ext-drivers/$(1)-$(2).tar.gz || wget https://sour
 $(1)@src 	:= tar xf @SRCDIR@/ext-drivers/$(1)-$(2).tar.gz && ln -s $(1)-$(2)/src $(1)
 $(1)@patch 	:= patches/intel--$(1)--$(2)
 $(1)@build 	 = make -C $(1) CFLAGS_EXTRA="$$($(1)@cflags) $(EXTRA_CFLAGS)" @KOPTS@ NETMAP_DRIVER_SUFFIX=@DRVSUFFIX@ KSRC=@KSRC@ KBUILD_EXTRA_SYMBOLS=@BUILDDIR@/Module.symvers
-$(1)@install 	 = make -C $(1) install INSTALL_MOD_PATH=@MODPATH@ CFLAGS_EXTRA="$$($(1)@cflags) $(EXTRA_CFLAGS)" NETMAP_DRIVER_SUFFIX=@DRVSUFFIX@ KSRC=@KSRC@
+$(1)@install 	 = make -C $(1) install INSTALL_MOD_PATH=@MODPATH@ CFLAGS_EXTRA="$$($(1)@cflags) $(EXTRA_CFLAGS)" NETMAP_DRIVER_SUFFIX=@DRVSUFFIX@ KSRC=@KSRC@ KBUILD_EXTRA_SYMBOLS=@BUILDDIR@/Module.symvers
 $(1)@clean 	 = if [ -d $(1) ]; then make -C $(1) clean CFLAGS_EXTRA="$$($(1)@cflags) $(EXTRA_CFLAGS)" NETMAP_DRIVER_SUFFIX=@DRVSUFFIX@ KSRC=@KSRC@; fi
 $(1)@distclean	:= rm -rf $(1)-$(2)
 $(1)@force	:= 1