[Patch, libgfortran] PR53445/53444 - Fix compilation on VxWorks

[Tobias Burnus]

The attached patches fix compilation issues on VxWorks.

a) VxWorks has strerror_r but contrary to POSIX, the function in VxWorks 
(at least in older versions) takes only two arguments: errnum and buf 
and not also the buffer length. I added a configure check for that variant.

b) There is no sticky bit on VxWorks - which is now ignored via an #ifdef.

The patch of (b) is the bug reporter's and, thus, tested on VxWorks.

(a) and (b) have been successfully bootstrapped on x86-64-linux.

OK for the trunk?

(I have regenerated the files with the latest 1.11 automake (1.11.5). 
Before the committal, I will re-generate them with 1.11.1.)

Tobias

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