fixed generation of configure and config.h.in by autoreconf
fixed running of autoreconf -fi
upgraded autoconf/config.sub, to detect arm-linux-androideabi as valid platform
removed check for signal (fails on android, even though it's available)

signal is defined in signal.h and it's not included in the test code
generated by configure, so it doesn't get linked in
removed check for setpgrp which cannot be run when cross compiling
fixed configure and build error due to missing lockf on android

still need to disable xattr support during configure, and build fails
to generate executables
major autoconf cleanup and upgrade

Use

	autoreconf -Iautoconf/m4

in the project root directory in order to regenerate configure and
src/config.h (no need to copy/move any file)
fixed static build on android

must configure with '--disable-libtool --enable-static'
must configure openssl with 'no-shared zlib no-dso'
added skeleton build procedure for ARM-based android devices
added autoconf/mkinstalldirs, was removed by mistake during autoconf cleanup
Merge pull request #156 from ZungBang/android

major autoconf cleanup plus initial support for android