eglibc: run libm-err-tab.pl with specific dirs in ${S}

eglibc: run libm-err-tab.pl with specific dirs in ${S}

libm-err-tab.pl will parse all the files named "libm-test-ulps"
in the given dir recursively. To avoid parsing the one in
${S}/.pc/ (it does exist after eglibc adds aarch64 support,
${S}/.pc/aarch64-0001-glibc-fsf-v1-eaf6f205.patch/ports/sysdeps/
aarch64/libm-test-ulps), run libm-err-tab.pl with specific dirs
in ${S}.

(From OE-Core rev: ca055169789b399e8a581350fecb58e21094fbf0)

Signed-off-by: Ting Liu <b28495@freescale.com>
Signed-off-by: Saul Wold <sgw@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>