* configure.ac: Define macro and conditional HAVE_ANDROID_SYSTEM.
* m4/gnupg-ttyname.m4: Force use of replacement on Android.
* src/ttyname_r.c: Ditto.
--
Android's bionic lib has no working ttyname_r() nor ttyname(). Using
them anyway will print
FIX ME! implement ttyname_r() bionic/libc/bionic/stubs.c:466
Thus we force the use of our replacement code which simply return
"/dev/tty".
* m4/gnupg-ttyname.m4: New. Based on ttyname_r from gnulib.
* src/ttyname_r.c (_gpgme_ttyname_r): Rename from ttyname_r.
Implement hacks required for Solaris and possible other non-fully
Posix systems.
* src/util.h: Include unistd.h. Redefine ttyname_r depending on
REPLACE_TTYNAME_R and put it into the gpgme name space.
--
Unfortunately we cant not use the ttyname_r replacement from gnulib
because we want to keep GPGME LGPLv2+.
