build with autoconf/automake, add jenkins.sh script

Add configure.ac and Makefile.ams to build with
  autoreconf && ./configure && make
like most other Osmocom projects.

Add jenkins.sh for a gerrit build job to verify patches.

Change-Id: I6b4419dd519f3d0a75235d0c22bf899f075347a3
diff --git a/.gitignore b/.gitignore
index 3224f97..d06928b 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,4 +1,24 @@
 *.o
 *.db
-src/hlr
+.*.sw?
+.version
+Makefile
+Makefile.in
+aclocal.m4
+autom4te.cache
+compile
+config.guess
+config.log
+config.status
+config.sub
+configure
+depcomp
+install-sh
+libtool
+ltmain.sh
+m4
+missing
+.deps
+
+src/osmo-hlr
 src/db_test