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

tools/elfutils/patches/100-portability.patch

@@ -89,23 +89,6 @@
  dnl The directories with content.
  
  dnl Documentation.
---- a/Makefile.am
-+++ b/Makefile.am
-@@ -26,11 +26,11 @@ AM_MAKEFLAGS = --no-print-directory
- 
- pkginclude_HEADERS = version.h
- 
--SUBDIRS = config lib libelf libcpu backends libebl libdwelf libdwfl libdw \
--	  libasm debuginfod src po doc tests
-+SUBDIRS = libgnu config lib libelf libcpu backends libebl libdwelf libdwfl libdw
- 
- EXTRA_DIST = elfutils.spec GPG-KEY NOTES CONTRIBUTING SECURITY \
--	     COPYING COPYING-GPLV2 COPYING-LGPLV3
-+	     COPYING COPYING-GPLV2 COPYING-LGPLV3 \
-+		 m4/gnulib-cache.m4
- 
- # Make sure the test install uses lib64 when $LIB will yield lib64.
- # Make sure the test build uses the same compiler, which on e.g. ppc64
 --- a/libelf/elf_update.c
 +++ b/libelf/elf_update.c
 @@ -37,6 +37,33 @@