Remove unused function warning from AC_C_INLINE

[Kurt Schwehr]

See also:  http://lists.gnu.org/archive/html/bug-autoconf/2014-06/msg00004.html

git diff

diff --git a/lib/autoconf/c.m4 b/lib/autoconf/c.m4

index b58e42d..877b030 100644

--- a/lib/autoconf/c.m4

+++ b/lib/autoconf/c.m4

@@ -1742,7 +1742,7 @@ for ac_kw in inline __inline__ __inline; do

 [#ifndef __cplusplus

 typedef int foo_t;

 static $ac_kw foo_t static_foo () {return 0; }

-$ac_kw foo_t foo () {return 0; }

+$ac_kw foo_t foo () {static_foo(); }

 #endif

 ])],

                    [ac_cv_c_inline=$ac_kw])

make check TESTSUITEFLAGS='218 219'

## --------------------------------------- ##

## GNU Autoconf 2.69.120-5dcda test suite. ##

## --------------------------------------- ##

Autotest.

218: C unit tests                                    ok

219: C unit tests (EXEEXT)                           ok

## ------------- ##

## Test results. ##

## ------------- ##

ac_c_inline.patch
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