Merge pull request dotnet/coreclr#12139 from pgavlin/coredistoolsfix
authorPat Gavlin <pgavlin@gmail.com>
Wed, 7 Jun 2017 20:09:01 +0000 (13:09 -0700)
committerGitHub <noreply@github.com>
Wed, 7 Jun 2017 20:09:01 +0000 (13:09 -0700)
Define `__cdecl` if necessary in coredistools.h.

Commit migrated from https://github.com/dotnet/coreclr/commit/ff7810c64a12baae6829e80af33d328f0099c14c


Trivial merge