After patching configure restore the original modification time.  This
avoids running makefile targets that depend on configure such as the PDF
documentation in textproc/flex.

Reported by:	hrs
Approved by:	portmgr (bapt)
- Set PORTSCOUT, Do not use unstable versions
Older make (8 and 9) treats a string as one large string. Newer make (10+)
treats a string as a collection of words.

Somehow a double-space was introduced into CFLAGS, which caused gdb66's
configure to choke. Newer make had to be told to examine the entire line
to get rid of it, but that syntax (/W) was unknown to older make.

So, split the difference and just make a shell call to remove the space.
The port can now build on 10 and 11.
Left-align comment to appease older make.
Fix build on -stable and -current.