fixed various compile warnings.

bindings/java/jni/Makefile.am

configure.ac

samples/Makefile.am

tests/Makefile.am

tools/autotools/Makefile.am

tools/fiwalk/plugins/Makefile.am

tools/fiwalk/src/Makefile.am

tools/fstools/Makefile.am

tools/hashtools/Makefile.am

tools/imgtools/Makefile.am

tools/srchtools/Makefile.am

tools/vstools/Makefile.am

travis_build.sh

tsk/auto/Makefile.am

tsk/auto/auto_db.cpp

tsk/auto/tsk_case_db.h

tsk/base/tsk_base.h

tsk/fs/dcalc_lib.c

tsk/fs/dcat_lib.c

tsk/fs/dls_lib.c