MIPS/GAS: Treat local jump relocs the same no matter if REL or RELA

MIPS/GAS: Treat local jump relocs the same no matter if REL or RELA

Do not convert jump relocs against local MIPS16 or microMIPS symbols to
refer to a section symbol instead even on RELA targets, as it makes it
impossible for the linker to make a JAL to JALX conversion based on ISA
symbol annotation, breaking regular and compressed MIPS interlinking.

	gas/
	* config/tc-mips.c (mips_fix_adjustable): Also return 0 for
	jump relocations against MIPS16 or microMIPS symbols on RELA
	targets.
	* testsuite/gas/mips/jalx-local.d: New test.
	* testsuite/gas/mips/jalx-local-n32.d: New test.
	* testsuite/gas/mips/jalx-local-n64.d: New test.
	* testsuite/gas/mips/jalx-local.s: New test source.
	* testsuite/gas/mips/mips.exp: Run the new tests.

	ld/
	* testsuite/ld-mips-elf/jalx-local.d: New test.
	* testsuite/ld-mips-elf/jalx-local-n32.d: New test.
	* testsuite/ld-mips-elf/jalx-local-n64.d: New test.
	* testsuite/ld-mips-elf/mips-elf.exp: Run the new tests.