Makefile: use -z pack-relative-relocs

Commit 27f2a4d ("Makefile: fix GDB warning with CONFIG_RELR")
added --use-android-relr-tags to fix a GDB warning

BFD: /android0/linux-next/vmlinux: unknown type [0x13] section `.relr.dyn'

The GDB warning has been fixed in version 11.2.

The DT_ANDROID_RELR tag was deprecated since DT_RELR was standardized.
Thus, --use-android-relr-tags should be removed. While making the
change, replace --pack-dyn-relocs=relr with -z pack-relative-relocs,
which is supported since LLD 15.

As of today, GNU ld supports the latter option for x86 and powerpc64
ports and has no intention to support --pack-dyn-relocs=relr. In the
absence of the glibc symbol version GLIBC_ABI_DT_RELR,
--pack-dyn-relocs=relr and -z pack-relative-relocs are identical in
ld.lld.

Link: ClangBuiltLinux#1057
Link: https://sourceware.org/git/?p=binutils-gdb.git;a=commit;h=a619b58721f0a03fd91c27670d3e4c2fb0d88f1e
Signed-off-by: Fangrui Song <maskray@google.com>

Makefile

@@ -1113,7 +1113,7 @@ LDFLAGS_vmlinux	+= -X
 endif
 
 ifeq ($(CONFIG_RELR),y)
-LDFLAGS_vmlinux	+= --pack-dyn-relocs=relr --use-android-relr-tags
+LDFLAGS_vmlinux	+= -z pack-relative-relocs
 endif
 
 # We never want expected sections to be placed heuristically by the

scripts/tools-support-relr.sh

@@ -7,8 +7,7 @@ trap "rm -f $tmp_file.o $tmp_file $tmp_file.bin" EXIT
 cat << "END" | $CC -c -x c - -o $tmp_file.o >/dev/null 2>&1
 void *p = &p;
 END
-$LD $tmp_file.o -shared -Bsymbolic --pack-dyn-relocs=relr \
-  --use-android-relr-tags -o $tmp_file
+$LD $tmp_file.o -shared -Bsymbolic -z pack-relative-relocs -o $tmp_file
 
 # Despite printing an error message, GNU nm still exits with exit code 0 if it
 # sees a relr section. So we need to check that nothing is printed to stderr.