glibc: fix sh4 compile error

Fixes:

/tmp/output/build/glibc-2.25/build/libc_pic.a(dl-error.os): In function `__GI__dl_signal_error':
dl-error.c:(.text+0x0): multiple definition of `_dl_signal_error'
/tmp/output/build/glibc-2.25/build/elf/dl-allobjs.os:(.text+0x134d8): first defined here
/tmp/output/build/glibc-2.25/build/libc_pic.a(dl-error.os): In function `__GI__dl_catch_error':
dl-error.c:(.text+0x190): multiple definition of `_dl_catch_error'
/tmp/output/build/glibc-2.25/build/elf/dl-allobjs.os:(.text+0x136fc): first defined here
/tmp/output/build/glibc-2.25/build/libc_pic.a(init-first.os):(.data+0x0): multiple definition of `__libc_multiple_libcs'
/tmp/output/build/glibc-2.25/build/elf/dl-allobjs.os:(.bss+0x6c): first defined here
/tmp/output/build/glibc-2.25/build/libc_pic.a(_itoa.os): In function `_itoa':
_itoa.c:(.text+0xd4): multiple definition of `_itoa'
/tmp/output/build/glibc-2.25/build/elf/dl-allobjs.os:(.text+0x133c8): first defined here

Signed-off-by: Waldemar Brodkorb <wbx@openadk.org>
Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>