[gdk-pixbuf] build: Drop unused configure checks

[Bastien Nocera <hadess src gnome org>]

commit 61e961d7a8525f11c5843bf2858946da1e2f7b26
Author: Kalev Lember <kalevlember gmail com>
Date:   Tue Oct 28 11:01:28 2014 +0100

    build: Drop unused configure checks
    
    A few unneeded configure checks got carried over when gdk-pixbuf was
    split out from gtk+. Drop them.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=739283

 configure.ac |   15 ---------------
 1 files changed, 0 insertions(+), 15 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index aaf3eee..2b64adf 100644
--- a/configure.ac
+++ b/configure.ac
@@ -904,23 +904,8 @@ fi
 
 AM_CONDITIONAL(USE_MMX, test x$use_mmx_asm = xyes)
 
-REBUILD_PNGS=
-if test -z "$LIBPNG" && test x"$os_win32" = xno -o x$with_gdiplus = xno; then
-  REBUILD_PNGS=#
-fi
-
-dnl Look for a host system's gdk-pixbuf-csource if we are cross-compiling
-
 AM_CONDITIONAL(CROSS_COMPILING, test $cross_compiling = yes)
 
-if test $cross_compiling = yes; then
-  AC_PATH_PROG(GDK_PIXBUF_CSOURCE, gdk-pixbuf-csource, no)
-  AC_PATH_PROG(GTK_UPDATE_ICON_CACHE, gtk-update-icon-cache, no)
-  if test x$GTK_UPDATE_ICON_CACHE = xno; then
-    REBUILD_PNGS=#
-  fi
-fi
-
 GDK_PIXBUF_PACKAGES="gmodule-no-export-2.0 gobject-2.0 gio-2.0"
 GDK_PIXBUF_EXTRA_LIBS="$STATIC_LIB_DEPS $MATH_LIB $MEDIA_LIB"
 GDK_PIXBUF_EXTRA_CFLAGS=