Import .gitignore for Autotools from Github

.gitignore

@@ -1,3 +1,61 @@
+# https://github.com/github/gitignore/blob/main/Autotools.gitignore
+# http://www.gnu.org/software/automake
+
+Makefile.in
+/ar-lib
+/mdate-sh
+/py-compile
+/test-driver
+/ylwrap
+.deps/
+.dirstamp
+
+# http://www.gnu.org/software/autoconf
+
+autom4te.cache
+/autoscan.log
+/autoscan-*.log
+/aclocal.m4
+/compile
+/config.cache
+/config.guess
+/config.h.in
+/config.log
+/config.status
+/config.sub
+/configure
+/configure.scan
+/depcomp
+/install-sh
+/missing
+/stamp-h1
+
+# https://www.gnu.org/software/libtool/
+
+/ltmain.sh
+
+# http://www.gnu.org/software/texinfo
+
+/texinfo.tex
+
+# http://www.gnu.org/software/m4/
+
+m4/libtool.m4
+m4/ltoptions.m4
+m4/ltsugar.m4
+m4/ltversion.m4
+m4/lt~obsolete.m4
+
+# Generated Makefile
+# (meta build system like autotools,
+# can automatically generate from config.status script
+# (which is called by configure script))
+Makefile
+
+# ----------------------------------------------------
+# poudriere-specific gitignore from here
+
+build-aux/
 *.o
 *.la
 *.lo
@@ -35,13 +93,14 @@ Makefile
 configure~
 build-aux/install-sh~
 build-aux/test-driver.orig
+!build-aux/test-driver
 config.cache
 config.status
 config.log
 host-upgrade.sh
-poudriere.fossil
 src/bin/poudriere.8.gz
 src/config.h
+src/config.h.in
 src/config.h.in~
 src/etc/rc.d/poudriered
 src/stamp-h1