[gdk-pixbuf] build: Remove specific Digital Unix 4/Tru64 support

[Bastien Nocera <hadess src gnome org>]

commit 283a814b5f479d9172aacc97db06e4bc41a31c5c
Author: Bastien Nocera <hadess hadess net>
Date:   Tue Aug 1 10:37:09 2017 +0100

    build: Remove specific Digital Unix 4/Tru64 support

 configure.ac |   24 ------------------------
 1 files changed, 0 insertions(+), 24 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index da86b42..cdc3577 100644
--- a/configure.ac
+++ b/configure.ac
@@ -336,30 +336,6 @@ AC_SUBST(GETTEXT_PACKAGE)
 AC_DEFINE_UNQUOTED(GETTEXT_PACKAGE, "$GETTEXT_PACKAGE",
                    [The prefix for our gettext translation domains.])
 
-dnl The DU4 header files don't provide library prototypes unless
-dnl -std1 is given to the native cc.
-AC_MSG_CHECKING([for extra flags to get ANSI library prototypes])
-
-gtk_save_LIBS=$LIBS
-LIBS="$LIBS -lm"
-AC_TRY_RUN([#include <math.h>
-             int main (void) { return (log(1) != log(1.)); }],
-     AC_MSG_RESULT(none needed),
-     gtk_save_CFLAGS="$CFLAGS"
-     CFLAGS="$CFLAGS -std1"
-     AC_TRY_RUN([#include <math.h>
-                 int main (void) { return (log(1) != log(1.)); }],
-         AC_MSG_RESULT(-std1),
-         AC_MSG_RESULT()
-         CFLAGS="$gtk_save_CFLAGS"
-         AC_MSG_WARN(
-                [No ANSI prototypes found in library. (-std1 didn't work.)]),
-         true
-     ),
-     AC_MSG_RESULT(none needed)
-)
-LIBS=$gtk_save_LIBS
-
 AC_MSG_CHECKING(for the BeOS)
 case $host in
   *-*-beos*)