[gparted] Silence subdir-objects warning from automake 1.14 (#781978)

[Curtis Gedak <gedakc src gnome org>]

commit f31808989ab7562ad411911c8b2dc16958708be8
Author: Mike Fleetwood <mike fleetwood googlemail com>
Date:   Wed Jun 21 13:55:59 2017 +0100

    Silence subdir-objects warning from automake 1.14 (#781978)
    
    Configuring GParted on a machine with automake >= 1.14 produces this
    warning:
    
        $ ./autogen.sh
        ...
        lib/gtest/Makefile.am:58: warning: source file 'src/gtest-all.cc' is in a subdirectory,
        lib/gtest/Makefile.am:58: but option 'subdir-objects' is disabled
        automake: warning: possible forward-incompatibility.
        automake: At least a source file is in a subdirectory, but the 'subdir-objects'
        automake: automake option hasn't been enabled.  For now, the corresponding output
        automake: object file(s) will be placed in the top-level directory.  However,
        automake: this behaviour will change in future Automake versions: they will
        automake: unconditionally cause object files to be placed in the same subdirectory
        automake: of the corresponding sources.
        automake: You are advised to start using 'subdir-objects' option throughout your
        automake: project, to avoid future incompatibilities.
        lib/gtest/Makefile.am:60: warning: source file 'src/gtest_main.cc' is in a subdirectory,
        lib/gtest/Makefile.am:60: but option 'subdir-objects' is disabled
        lib/gtest/Makefile.am: installing './depcomp'
        tests/Makefile.am:22: warning: source file '../src/BlockSpecial.cc' is in a subdirectory,
        tests/Makefile.am:22: but option 'subdir-objects' is disabled
        tests/Makefile.am:23: warning: source file '../src/PipeCapture.cc' is in a subdirectory,
        tests/Makefile.am:23: but option 'subdir-objects' is disabled
        ...
    
    From the automake 1.14 NEWS file:
        http://git.savannah.gnu.org/cgit/automake.git/tree/NEWS?h=v1.14#n125
    
        "The next major Automake version (2.0) will unconditionally activate
        the 'subdir-objects' option.  In order to smooth out the transition,
        we now give a warning (in the category 'unsupported') whenever a
        source file is present in a subdirectory but the 'subdir-object' is
        not enabled.  For example, the following usage will trigger such a
        warning:
    
            bin_PROGRAMS = sub/foo
            sub_foo_SOURCES = sub/main.c sub/bar.c
        "
    
    Set the subdir-objects automake option, silencing the warning.
    
    Bug 781978 - Add Google Test C++ test framework

 configure.ac |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index b5e3d24..cfbdd27 100644
--- a/configure.ac
+++ b/configure.ac
@@ -5,7 +5,7 @@ AC_CONFIG_SRCDIR([src/main.cc])
 AC_CONFIG_HEADERS([config.h])
 AC_CONFIG_MACRO_DIR([m4])
 
-AM_INIT_AUTOMAKE([1.9])
+AM_INIT_AUTOMAKE([1.9 subdir-objects])
 AM_MAINTAINER_MODE