tools/elfutils: simplify and cleanup Makefile

After changes to default host build recipes
and default variable definitions,
several custom definitions can be removed,
and the gnulib recipes replaced
with hooks to common recipes.

Also remove leftover PKG_INSTALL
which has no effect for host builds.

Signed-off-by: Michael Pratt <mcpratt@pm.me>
Link: https://github.com/openwrt/openwrt/pull/15853
Signed-off-by: Robert Marko <robimarko@gmail.com>

tools/elfutils/Makefile

@@ -15,12 +15,10 @@ PKG_LICENSE_FILES:=COPYING COPYING-GPLV2 COPYING-LGPLV3
 PKG_CPE_ID:=cpe:/a:elfutils_project:elfutils
 
 PKG_FIXUP:=autoreconf
-PKG_INSTALL:=1
 
 PKG_PROGRAMS:=elflint findtextrel elfcmp unstrip stack elfcompress elfclassify srcfiles
 
 PKG_SUBDIRS := \
-	libgnu \
 	config \
 	lib \
 	libelf \
@@ -36,8 +34,6 @@ PKG_GNULIB_BASE:=libgnu
 
 PKG_GNULIB_ARGS = \
 	--dir=$(HOST_BUILD_DIR) \
-	--local-dir=$(STAGING_DIR_HOST)/share/gnulib \
-	--source-base=$(PKG_GNULIB_BASE) \
 	--libtool \
 	--avoid=reallocarray \
 	--import
@@ -74,7 +70,6 @@ ifeq ($(HOST_OS),Darwin)
 endif
 
 HOST_CFLAGS += -Wno-error -fPIC
-HOST_CXXFLAGS += -O2
 
 HOST_CONFIGURE_ARGS += \
 	--without-libintl-prefix \
@@ -98,18 +93,8 @@ HOST_CONFIGURE_VARS += \
 	ac_cv_search__obstack_free=yes \
 	ac_cv_buildid=yes
 
-Hooks/HostConfigure/Pre := Host/Gnulib $(Hooks/HostConfigure/Pre)
-define Host/Gnulib
-	$(STAGING_DIR_HOST)/bin/gnulib-tool $(PKG_GNULIB_ARGS) $(PKG_GNULIB_MODS);
-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
+Hooks/HostConfigure/Pre := Host/Gnulib/Prepare $(Hooks/HostConfigure/Pre)
+Hooks/HostCompile/Pre := Host/Gnulib/Compile $(Hooks/HostCompile/Pre)
 
 define Host/Uninstall
 	-$(call Host/Compile/Default,uninstall)