[Ohrrpgce] SVN: teeemcee/11204 scons: fix linkgcc=0 on Windows (requires FB 1.06+)

[subversion at HamsterRepublic.com]

teeemcee
2019-08-04 05:20:50 -0700 (Sun, 04 Aug 2019)
277
scons: fix linkgcc=0 on Windows (requires FB 1.06+)

Apparently I didn't actually test it in my recent commit about fixing linkgcc=0?
(It compiled but didn't run). I think linkgcc=0 on Windows may not have worked
for many years - 2013 is the last mention I found of it working.
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U   wip/SConscript