build fails with GDC on Windows due to path separator issues.

[bruno-medeiros]

Using dub with --compiler=gdc on Windows fails due to path separator issues. Here a sample of the verbose output:

Building configuration "application", build type debug
Application output name is 'D:\projects\D.Scratchpad\DubBasicTest\dub_basic_test.exe'
Running gdc...
gdc -o D:\projects\D.Scratchpad\DubBasicTest\dub_basic_test.exe -fversion=Have_dub_basic_test -ID:\projects\D.Scratchpad\DubBasicTest\source source\app.d source\func_mod.d
gdc: error: sourceapp.d: No such file or directory
gdc: error: sourcefunc_mod.d: No such file or directory
gdc: fatal error: no input files
compilation terminated.
Error: Build command failed with exit code 1

Someone is interpreting those backlashes as escape characters. And it seems to be dub, since if I invoke gdc directly from the cmd-line, with the gdc line above, works.