Fixed build on systems with libc6

[kovalexal]

This patch fixes tomita-parser build on modern Linux systems with libc6 instead of libc5.

All modifications were done according to:

• https://github.com/coreutils/gnulib/blob/master/lib/stdio-impl.h
• https://src.fedoraproject.org/rpms/m4/blob/814d592134fad36df757f9a61422d164ea2c6c9b/f/m4-1.4.18-glibc-change-work-around.patch

[kovalexal]

travis-ci failed to build because of missing key

[kovalexal]

Added travis-ci public key to build