Change the default to -fgnu89-inline, as RHEL5 headers aren't ready.

--- gcc/c-opts.c.jj	2008-08-21 04:06:31.000000000 -0400
+++ gcc/c-opts.c	2008-08-21 04:06:48.000000000 -0400
@@ -1048,7 +1048,7 @@ c_common_post_options (const char **pfil
   /* By default we use C99 inline semantics in GNU99 or C99 mode.  C99
      inline semantics are not supported in GNU89 or C89 mode.  */
   if (flag_gnu89_inline == -1)
-    flag_gnu89_inline = !flag_isoc99;
+    flag_gnu89_inline = 1;
   else if (!flag_gnu89_inline && !flag_isoc99)
     error ("-fno-gnu89-inline is only supported in GNU99 or C99 mode");
 
--- gcc/testsuite/gcc.dg/inline-32.c.jj	2008-07-08 04:01:25.000000000 -0400
+++ gcc/testsuite/gcc.dg/inline-32.c	2008-08-21 04:05:40.000000000 -0400
@@ -1,5 +1,5 @@
 /* { dg-do link } */
-/* { dg-options "-std=c99 -pedantic-errors" } */
+/* { dg-options "-std=c99 -pedantic-errors -fno-gnu89-inline" } */
 /* { dg-additional-sources inline-32a.c } */
 inline int f (void) { return 0; }
 
--- gcc/testsuite/gcc.dg/inline-25.c.jj	2008-04-28 08:22:39.000000000 -0400
+++ gcc/testsuite/gcc.dg/inline-25.c	2008-08-21 04:05:17.000000000 -0400
@@ -1,6 +1,6 @@
 /* PR c/35017 */
 /* { dg-do compile } */
-/* { dg-options "-std=iso9899:1999 -pedantic-errors" } */
+/* { dg-options "-std=iso9899:1999 -pedantic-errors -fno-gnu89-inline" } */
 
 static int a = 6;
 static const int b = 6;
--- gcc/testsuite/gcc.dg/inline-26.c.jj	2008-04-28 08:22:38.000000000 -0400
+++ gcc/testsuite/gcc.dg/inline-26.c	2008-08-21 04:05:28.000000000 -0400
@@ -1,6 +1,6 @@
 /* PR c/35017 */
 /* { dg-do compile } */
-/* { dg-options "-std=gnu99" } */
+/* { dg-options "-std=gnu99 -fno-gnu89-inline" } */
 
 static int a = 6;
 static const int b = 6;
--- gcc/testsuite/gcc.dg/inline-15.c.jj	2008-04-28 08:22:38.000000000 -0400
+++ gcc/testsuite/gcc.dg/inline-15.c	2008-08-21 04:05:04.000000000 -0400
@@ -1,7 +1,7 @@
 /* Check that an error message is produced when a C99 inline function
    is never defined.  */
 /* { dg-do compile } */
-/* { dg-options "-std=c99" } */
+/* { dg-options "-std=c99 -fno-gnu89-inline" } */
 
 extern inline int func1 (void); /* { dg-warning "never defined" } */
 inline int func2 (void); /* { dg-warning "never defined" } */
--- gcc/testsuite/gcc.dg/inline-14.c.jj	2008-04-28 08:22:39.000000000 -0400
+++ gcc/testsuite/gcc.dg/inline-14.c	2008-08-21 04:04:51.000000000 -0400
@@ -1,6 +1,6 @@
 /* Check that you can't redefine a C99 inline function.  */
 /* { dg-do compile } */
-/* { dg-options "-std=c99" } */
+/* { dg-options "-std=c99 -fno-gnu89-inline" } */
 
 extern inline int func1 (void)
 { /* { dg-error "previous definition" } */
--- gcc/testsuite/gcc.dg/inline-13.c.jj	2008-04-28 08:22:39.000000000 -0400
+++ gcc/testsuite/gcc.dg/inline-13.c	2008-08-21 04:04:15.000000000 -0400
@@ -1,6 +1,6 @@
 /* Verify basic C99 inline functionality.  */
 /* { dg-do compile } */
-/* { dg-options "-std=c99" } */
+/* { dg-options "-std=c99 -fno-gnu89-inline" } */
 /* { dg-final { scan-assembler-not "dontgenerate" } } */
 /* { dg-final { scan-assembler "func1" } } */
 /* { dg-final { scan-assembler "func2" } } */
--- gcc/testsuite/gcc.target/i386/pr39013-2.c.jj	2009-02-03 14:48:58.000000000 -0500
+++ gcc/testsuite/gcc.target/i386/pr39013-2.c	2009-04-29 02:54:07.000000000 -0400
@@ -1,6 +1,6 @@
 /* PR target/39013 */
 /* { dg-do compile { target *-*-linux* } } */
-/* { dg-options "-O2 -fpie -std=gnu99" } */
+/* { dg-options "-O2 -fpie -std=gnu99 -fno-gnu89-inline" } */
 
 inline int foo (void);		/* { dg-warning "declared but never defined" } */
 extern inline int bar (void);	/* { dg-warning "declared but never defined" } */