autoconf: move aux directory, define AC_CONFIG_AUX_DIR()

The name "aux" is reserved on Windows platforms, a legacy from CP/M
via MS-DOS. Rename it to "helpers".

Turns out that that directory wasn't actually used properly, because
AC_CONFIG_AUX_DIR was never defined, and there was a redundant copy of
install-sh checked into the base of the source tree.

Reported-by: Ehsan Alem Mohammad Ghasemlou <e.ghasemloo@gmail.com>
NASM-Bugzilla: https://bugzilla.nasm.us/show_bug.cgi?id=3392560
Signed-off-by: H. Peter Anvin <hpa@zytor.com>

4 files changed, 0 insertions, 0 deletions

diff --git a/autoconf/aux/compile b/autoconf/helpers/compile
index 99e50524..99e50524 100755
--- a/autoconf/aux/compile
+++ b/autoconf/helpers/compile
diff --git a/autoconf/aux/config.guess b/autoconf/helpers/config.guess
index 256083a7..256083a7 100755
--- a/autoconf/aux/config.guess
+++ b/autoconf/helpers/config.guess
diff --git a/autoconf/aux/config.sub b/autoconf/helpers/config.sub
index 20f7cf29..20f7cf29 100755
--- a/autoconf/aux/config.sub
+++ b/autoconf/helpers/config.sub
diff --git a/autoconf/aux/install-sh b/autoconf/helpers/install-sh
index 8175c640..8175c640 100755
--- a/autoconf/aux/install-sh
+++ b/autoconf/helpers/install-sh