inline cleanup, part 1

[Bruno Haible]

Reviewing the uses of 'inline', 'HAVE_INLINE', AC_C_INLINE against each other,
there are a couple of mismatches.

Part 1: Uses of AC_C_INLINE that are not necessary. I'm applying this:


2009-12-31  Bruno Haible  <address@hidden>

        Remove unnecessary AC_C_INLINE invocation.
        * m4/popen.m4 (gl_PREREQ_POPEN): Don't invoke AC_C_INLINE. Not needed
        since 2009-08-21.

--- m4/popen.m4.orig    Thu Dec 31 15:12:00 2009
+++ m4/popen.m4 Thu Dec 31 14:59:21 2009
@@ -1,4 +1,4 @@
-# popen.m4 serial 1
+# popen.m4 serial 2
 dnl Copyright (C) 2009 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
@@ -30,5 +30,5 @@
 # Prerequisites of lib/popen.c.
 AC_DEFUN([gl_PREREQ_POPEN],
 [
-  AC_REQUIRE([AC_C_INLINE])
+  :
 ])