Use autotools (autoconf, automake) to build keyd

.autom4te.cfg

@@ -0,0 +1,6 @@
+# Disable autom4te cache to ensure that any change to the version extraction
+# script triggers a rebuild of the configure script.  See
+# <https://lists.gnu.org/r/automake/2019-10/msg00002.html>.
+begin-language: "Autoconf-without-aclocal-m4"
+args: --no-cache
+end-language: "Autoconf-without-aclocal-m4"

.gitignore

@@ -6,9 +6,33 @@ tags
 bin/
 *.o
 *.gch
+.deps/
+.dirstamp
+/*.1
+/.dist-version
+/Makefile
+/Makefile.in
+/aclocal.m4
+/autoconfig.h
+/autoconfig.h.in
+/autom4te.cache/
+/build-aux/*
+!/build-aux/git-version-gen
+/compose.stamp
+/compose.stamp.tmp
+/config.log
+/config.status
+/configure
+/keyd
+/keyd-*.tar.gz
+/keyd-application-mapper
+/keyd.compose
+/src/unicode.c
+/stamp-h1
+/t/*.log
+/t/*.trs
+/test-io
+/test-suite.log
 __pycache__
 test.log
 keyd.service
-/data/*.1.gz
-/data/keyd.compose
-/src/unicode.c