Allow external projects to be downloaded into the tree and used

Signed-off-by: Jan Engelhardt <jengelh@computergmbh.de>

extensions/GNUmakefile.in

@@ -35,6 +35,7 @@ endif
 #	Wildcard module list
 #
 include ${top_srcdir}/mconfig
+-include ${top_srcdir}/mconfig.*
 pfx_all_mod   := $(patsubst ${srcdir}/libxt_%.c,%,$(wildcard ${srcdir}/libxt_*.c))
 pfx_build_mod := $(foreach i,${pfx_all_mod},$(if ${build_${i}},${i},))
 pfx_solibs    := $(patsubst %,libxt_%.so,${pfx_build_mod})

extensions/Kbuild

@@ -1,9 +1,12 @@
 # -*- Makefile -*-
 
 include ${XA_TOPSRCDIR}/mconfig
+-include ${XA_TOPSRCDIR}/mconfig.*
 
 obj-m                += compat_xtables.o
 
 obj-${build_LOGMARK} += xt_LOGMARK.o
 obj-${build_TARPIT}  += xt_TARPIT.o
 obj-${build_TEE}     += xt_TEE.o
+
+-include ${M}/*.Kbuild