[gcab] Remove the automake build system

[Richard Hughes <rhughes src gnome org>]

commit 1f5e053dd4bbca45b551081c4cb71daf90d00581
Author: Richard Hughes <richard hughsie com>
Date:   Tue Jan 23 11:19:13 2018 +0000

    Remove the automake build system

 Makefile.am               |  241 --------------------------------------------
 atlocal.in                |    5 -
 autogen.sh                |   22 ----
 build-aux/move-if-change  |   17 ---
 configure.ac              |   80 ---------------
 git.mk                    |  227 -----------------------------------------
 libgcab/Makefile.am       |    1 -
 libgcab/libgcab-1.0.pc.in |   11 --
 m4/ax_check_vscript.m4    |  142 --------------------------
 m4/manywarnings.m4        |  245 ---------------------------------------------
 m4/warnings.m4            |   61 -----------
 tests/package.m4.in       |    8 --
 tests/testsuite.at        |   60 -----------
 13 files changed, 0 insertions(+), 1120 deletions(-)