Remove sh-symbianelf support

bfd/
	* Makefile.am: Remove sh-symbianelf support.
	* config.bfd: Likewise.
	* configure.ac: Likewise.
	* targets.c: Likewise.
	* elf32-sh-symbian.c: Delete.
	* Makefile.in: Regenerate.
	* configure: Regenerate.
	* po/SRC-POTFILES.in: Regenerate.
gas/
	* config/tc-sh.c: Remove sh-symbianelf support.
	* config/tc-sh.h: Likewise.
	* configure.ac: Likewise.
	* configure.tgt: Likewise.
	* testsuite/gas/sh/reg-prefix.d: Likewise.
	* testsuite/gas/sh/sh2a-pic.d: Likewise.
	* config.in: Regenerate.
	* configure: Regenerate.
ld/
	* Makefile.am: Remove sh-symbianelf support.
	* configure.tgt: Likewise.
	* emulparams/shlsymbian.sh: Delete.
	* scripttempl/elf32sh-symbian.sc: Delete.
	* Makefile.in: Regenerate.
	* po/BLD-POTFILES.in: Regenerate.