Made NuGetGallery.msbuild more portable
Made NuGetGallery.msbuild more portable

skbkontur/NuGetGallery,mtian/SiteExtensionGallery,mtian/SiteExtensionGallery,grenade/NuGetGallery_download-count-patch,skbkontur/NuGetGallery,grenade/NuGetGallery_download-count-patch,mtian/SiteExtensionGallery,JetBrains/ReSharperGallery,ScottShingler/NuGetGallery,skbkontur/NuGetGallery,JetBrains/ReSharperGallery,KuduApps/NuGetGallery,projectkudu/SiteExtensionGallery,KuduApps/NuGetGallery,JetBrains/ReSharperGallery,KuduApps/NuGetGallery,projectkudu/SiteExtensionGallery,ScottShingler/NuGetGallery,ScottShingler/NuGetGallery,KuduApps/NuGetGallery,grenade/NuGetGallery_download-count-patch,projectkudu/SiteExtensionGallery,KuduApps/NuGetGallery