use automake and libtool

This commits replaces the handwritten makefile with automake+libtool.
There is some hackery needed for the LD_PRELOAD shared library,
but apart from that there is nothing special and it is a large gain in
portability and standardization.

The spec file is modified as little as is needed to properly build
the RPMs.

.gitignore

@@ -1,13 +1,25 @@
 /autom4te.cache 
+/depcomp
+/aclocal.m4
+/missing
+/config.guess
+/config.sub
+/install-sh
 /configure
 /config.h.in
+/Makefile.in
 /Makefile
+.deps
+.libs
 /stamp-h1
 *.o
-*.a
-*.so*
+*.lo
+*.la
 bin
 /config.h
 /config.log
 /config.status
+.dirstamp
+/libtool
+/ltmain.sh
 libiscsi-*.tar.gz