tools/libelf: use autoreconf to fix build failure on macOS with recent Xcode versions

Signed-off-by: Felix Fietkau <[email protected]>

tools/libelf/Makefile

@@ -18,8 +18,12 @@ PKG_SOURCE_URL:= \
 	http://distcache.freebsd.org/ports-distfiles/
 HOST_BUILD_PARALLEL:=1
 
+HOST_FIXUP:=autoreconf
+
 include $(INCLUDE_DIR)/host-build.mk
 
+PKG_REMOVE_FILES :=
+
 HOST_CONFIGURE_ARGS += \
 	--disable-shared \
 	--enable-elf64