This set of patches improve the platform specific code in progreloc.c.
Most BSD systems and Solaris nowadays have a way to retrieve the name
of the current executable, in a way similar to /proc/self/exe on Linux.


2019-02-19  Bruno Haible  <bruno@clisp.org>

	progreloc: Simplify code for Android.
	* lib/progreloc.c (executable_fd): Don't define on Android.
	(maybe_executable, find_executable): Don't use executable_fd on Android.

2019-02-19  Bruno Haible  <bruno@clisp.org>

	progreloc: Speed up executable lookup on various platforms.
	* lib/progreloc.c: Include <errno.h>.
	(safe_read, full_read): New functions.
	(find_executable): On GNU/kFreeBSD, FreeBSD, DragonFly, NetBSD, Solaris,
	prefer the information from the /proc file system to a PATH search.