Fix typo in BuildEnvironmentHelper (#1942)
Fix typo in BuildEnvironmentHelper (#1942)

currrent -> current
Microsoft/msbuild,AndyGerlicher/msbuild,jeffkl/msbuild,chipitsine/msbuild,cdmihai/msbuild,sean-gilliam/msbuild,sean-gilliam/msbuild,chipitsine/msbuild,AndyGerlicher/msbuild,rainersigwald/msbuild,Microsoft/msbuild,AndyGerlicher/msbuild,rainersigwald/msbuild,sean-gilliam/msbuild,cdmihai/msbuild,chipitsine/msbuild,jeffkl/msbuild,mono/msbuild,Microsoft/msbuild,rainersigwald/msbuild,rainersigwald/msbuild,mono/msbuild,chipitsine/msbuild,jeffkl/msbuild,jeffkl/msbuild,mono/msbuild,Microsoft/msbuild,cdmihai/msbuild,mono/msbuild,AndyGerlicher/msbuild,cdmihai/msbuild,sean-gilliam/msbuild