Fix 'string literal' warning for Android client

Under Android-4.4 this commit fixes the following warning:

     [exec] jni/./fwknop/fwknop_client.c: In function 'Java_com_max2idea_android_fwknop_Fwknop_sendSPAPacket':
     [exec] jni/./fwknop/fwknop_client.c:181:5: error: format not a string literal and no format arguments [-Werror=format-security]
     [exec] cc1: some warnings being treated as errors
[android] applied Gerry Reno's patch for Android-4.4
added Gerry Reno
[android] update to copy fko.h and associated files to jni/fwknop/ via get_libfko_header.sh
[android] add HMAC support (currently optional)
[android] update Makefile.am for latest Android directory tree
[android] Makefile.am minor script path update
[android] added project.properties file
[android] added ant.properties file
[android] added HMAC test along with non-legacy Rijndael test
[android] Added test/conf/hmac_android_access.conf file to Makefile.am
[android] updated README file, added project/sdk.paths file
merged android4.4_support branch
Merge branch 'master' of https://github.com/mrash/fwknop