Fix windows quoting

[FreddieAkeroyd]

• Fix Makefile quoting for WIn32 build
• Add epicsShareFunc for lcaMexGblInit

[FreddieAkeroyd]

Created as draft PR as the most recent tech-talk post mentioned a failure to build ezcaVarArrayTest.exe that I will look into, but everything else built fine

[till-s]

Thanks Freddie - so do you recommend holding off merging the PR until you get a chance to look into the ezcaVarArrayTest issue?

[FreddieAkeroyd]

@till-s I've posted a reply on tech-talk so we can just see if it is something simple , as far as i can see it should work as is, i've not got a matlab installation locally but that part of the build does not require matlab and seems to work fine for me

[till-s]

OK - the PR is still marked as 'draft' (preventing it from being merged). Just let me know when it is ready for me to hit the button :-)

[AlessandroDUffizi]

"@FreddieAkeroyd
Add epicsShareFunc to lcaMexGblInit

My experience on windows compilation is that this modification is fundamental. Otherwise the lcaMexGbIInit won't be exported and the windows compilation fails.
Differently from Linux, Windows doesn't export library functions as default.
So I think is a good idea to merge