win32: Replace LOCK_* constants with macros
win32: Replace LOCK_* constants with macros

Change LOCK_* from constants to preprocessor macros, because that's what
the code exporting them to javascript expects.

jeremycx/node-fs-ext,pmurias/node-fs-ext,ggreer/node-fs-ext,jeremycx/node-fs-ext,ggreer/node-fs-ext,baudehlo/node-fs-ext,ggreer/node-fs-ext,baudehlo/node-fs-ext,pmurias/node-fs-ext,baudehlo/node-fs-ext,CasperTech/node-fs-ext,jeremycx/node-fs-ext,jeremycx/node-fs-ext,ggreer/node-fs-ext,pmurias/node-fs-ext,CasperTech/node-fs-ext,CasperTech/node-fs-ext,pmurias/node-fs-ext,CasperTech/node-fs-ext