AS_EXECUTABLE_P enhancement

[Stepan Kasal]

Hi,
  AS_EXECUTABLE_P(file) currently expands to
        test -f file

I have read the discussion from Jan and Feb 2001 when this macro was
introduced, and only a month later reduced to the good old ``test -f''.

I propose

        (test -f && test -x)
or
        (test -f && : )

depending on a check at the init time.
 
Reading that discussion, I noticed no platform which would be harmed by
this.

Patch attached, opinions welcome,
        Stepan

autoconf-20041210-test-x.patch
Description: Text document