[Bug 747954] osx: fix libcheck and "make check" builds with clang

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=747954

--- Comment #3 from Julien Isorce <julien.isorce at gmail.com> ---
Some infos:

* From https://autotools.io/libtool/lafiles.html:

"inherited_linker_flags:
This variable lists selected link editor flags that are needed to ensure the
correct ABI is used with the library, for instance. In most cases, all you'll
be seeing in here is -pthread, as it's probably the only such flag used on
modern systems."

* In libtool's git log:

commit 2f15fc7d18de0492067f4c2c782d1c8bb624194e
Author: Christoph Egger <Christoph_Egger at gmx.de>
Date:   Wed Feb 23 03:30:30 2005 +0000

    * config/ltmain.m4sh (func_mode_link): Add -pthread like flags to
    inherited_linker_flags.

--- a/config/ltmain.m4sh
+++ b/config/ltmain.m4sh
@@ -2686,6 +2686,10 @@ func_mode_link ()
        compiler_flags="$compiler_flags $arg"
        compile_command="$compile_command $arg"
        finalize_command="$finalize_command $arg"
+       case "$new_inherited_linker_flags " in
+           *" $arg "*) ;;
+           * ) new_inherited_linker_flags="$new_inherited_linker_flags $arg"
;;
+       esac
        continue
        ;;

Also:
http://git.savannah.gnu.org/cgit/libtool.git/tree/build-aux/ltmain.in#n5161
http://git.savannah.gnu.org/cgit/libtool.git/tree/build-aux/ltmain.in#n5691

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