libc/glibc: fix {e,}glibc add-ons with short or long names

Fixes the issue with {e,}glibc addons having short and long names (such as
eglibc-ports-2_13 and ports), which caused configure scripts to run
through them twice and thus configuring incorrectly.

For instance, the mips64el-n32-linux-gnu toolchain would be recognized
correctly first, but then the second pass would change it to mips32,
building a mixed MIPS-III N32 and MIPS-I libc.

Signed-off-by: Nicolás Reynolds <fauno@kiwwwi.com.ar>
[yann.morin.1992@anciens.enib.fr: remove spurious trailing spaces]
Signed-off-by: "Yann E. MORIN" <yann.morin.1998@anciens.enib.fr>
(transplanted from af25723a794f2017f45c300369a6d36849e22236)

# Configuration file for sstrip tool facility

if OBSOLETE && ! BACKEND && ARCH_BINFMT_ELF

comment "sstrip"

config SSTRIP

    bool

    prompt "sstrip (OBSOLETE)"

    help

      The sstrip utility, to maximise the striping of ELF binaries

      (executables and libraries).

      Buildroot version, forked off the original from ELFkickers.

      This one is somewhat maintained by the buildroot guys.

      Supports big-endian systems.

      NOTE! Please read.

        sstrip is now deprecated in crosstool-NG, as it has a few

        shortcomings. For example: it breaks for PPC targets, it

        does not build on non-ELF hosts (eg. mingw32, MacOS-X...).

endif