x86: Properly check invalid relocation against protected symbol

Only check invalid relocation against protected symbol defined in shared
object.

bfd/

	PR ld/29377
	* elf32-i386.c (elf_i386_scan_relocs): Only check invalid
	relocation against protected symbol defined in shared object.
	* elf64-x86-64.c (elf_x86_64_scan_relocs): Likewise.

ld/

	PR ld/29377
	* testsuite/ld-elf/linux-x86.exp: Run PR ld/29377 tests.
	* testsuite/ld-elf/pr29377a.c: New file.
	* testsuite/ld-elf/pr29377b.c: Likewise.

(cherry picked from commit bd073612)

ld: Pass -nostdlib to compiler with -r

Pass -nostdlib to compiler with -r to avoid unnecessary .o file and
libraries.

	PR ld/29377
	* testsuite/ld-elf/linux-x86.exp: Pass -nostdlib with -r.

(cherry picked from commit 76e4fa70)