Replaced pushd and popd calls with equivalent shell code.

pushd and popd are not supported by ksh or sh [under Solaris at least].

autogen.sh

@@ -4,7 +4,8 @@
 srcdir=`dirname $0`
 test -z "$srcdir" && srcdir=.
 
-pushd $srcdir
+ORIGDIR=`pwd`
+cd $srcdir
 PROJECT=Gtk+
 TEST_TYPE=-d
 FILE=gdk
@@ -60,7 +61,7 @@ aclocal $ACLOCAL_FLAGS
 
 automake $am_opt
 autoconf
-popd
+cd $ORIGDIR
 
 $srcdir/configure "$@"