fexecve, execvpe

[Eric Blake]

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POSIX requires fexecve, and we had all the pieces ready to go.  And to my
surprise, we've had execvpe in the sources for a long time, but just
failed to export it (glibc just added execvpe in 2.10).  OK to apply,
along with the corresponding patch to new-features.sgml and tweaking
unistd.h in newlib?

P.S Any reason that "dtable.h" and "cygheap.h" aren't self-contained?

2009-09-26  Eric Blake  <ebb9@byu.net>

	* exec.cc (fexecve): New function.
	* cygwin.din (execvpe, fexecve): Export new fexecve and existing
	execvpe.
	* include/cygwin/version.h (CYGWIN_VERSION_API_MINOR): Bump.
	* posix.sgml: Mention them.

- --
Don't work too hard, make some time for fun as well!

Eric Blake             ebb9@byu.net
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