tools/elfutils: override SUBDIRS variable of Makefile

Instead of editing the SUBDIRS variable with a patch, it can be overriden
at the end of the command line when invoking Make.

This tool has a series of recursive Makefiles in each subdirectory,
therefore SUBDIRS is set to a pattern of Make functions so that the result
is variable depending on the current subdirectory that Make is being
invoked in.

It's not necessary to have gnulib-cache.m4 in EXTRA_DIST since we don't
need to re-import after packaging this in the SDK, so get rid of the
entire patch hunk for ./Makefile.am

Tested-by: Georgi Valkov <gvalkov@gmail.com> # MacOS
Signed-off-by: Michael Pratt <mcpratt@pm.me>
Signed-off-by: Tony Ambardar <itugrok@yahoo.com>

tools/elfutils/Makefile

@@ -17,6 +17,18 @@ PKG_CPE_ID:=cpe:/a:elfutils_project:elfutils
 PKG_FIXUP:=autoreconf
 PKG_INSTALL:=1
 
+PKG_SUBDIRS := \
+	libgnu \
+	config \
+	lib \
+	libelf \
+	libcpu \
+	backends \
+	libebl \
+	libdwelf \
+	libdwfl \
+	libdw
+
 include $(INCLUDE_DIR)/host-build.mk
 
 ifeq ($(HOST_OS),Darwin)
@@ -47,6 +59,14 @@ define Host/Gnulib
 	ln -sf ../lib/eu-config.h $(HOST_BUILD_DIR)/libgnu/;
 endef
 
+define Host/Compile
+	$(call Host/Compile/Default,SUBDIRS='$$$$(wildcard $(PKG_SUBDIRS))')
+endef
+
+define Host/Install
+	$(call Host/Compile/Default,install SUBDIRS='$$$$(wildcard $(PKG_SUBDIRS))')
+endef
+
 define Host/Uninstall
 	-$(call Host/Compile/Default,uninstall)
 endef