another build system suggestion

[Bruno Haible]

Texinfo already has 2 build-aux/ directories, but in the tp/Texinfo/XS/
the automake-imported files are cluttering the main directory. How about
moving them to a build-aux/ directory there as well?

Doing that consists of 3 steps:

1) Apply this patch:

diff --git a/tp/Texinfo/XS/configure.ac b/tp/Texinfo/XS/configure.ac
index 4597425661..5e986f5e5a 100644
--- a/tp/Texinfo/XS/configure.ac
+++ b/tp/Texinfo/XS/configure.ac
@@ -11,6 +11,7 @@
 # implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 #
 AC_INIT([texinfo], [0])
+AC_CONFIG_AUX_DIR([build-aux])
 AM_INIT_AUTOMAKE
 AC_CONFIG_MACRO_DIR([gnulib/m4])
 

2) $ cd tp/Texinfo/XS
   $ .../gnulib-tool --update

3) $ cd tp/Texinfo/XS
   $ rm -f compile config.guess config.sub depcomp install-sh ltmain.sh missing
   $ rm -f config.rpath


Bruno