Fails to build on Windows

[StefanSch]

With Energia version 1.8.7E21 the build fails on windows on the copy command at the end:
Replacing in slash with backslash on this line in platform.txt fixes the problem:
Change from:
recipe.hooks.linking.postlink.1.pattern.windows=cmd /c copy "{build.system.path}/energia/energia_pm4fg.rov.xs" "{build.path}"
To:
recipe.hooks.linking.postlink.1.pattern.windows=cmd /c copy "{build.system.path}\energia\energia_pm4fg.rov.xs" "{build.path}"