Cease setting PLATFORM environment variable
Cease setting PLATFORM environment variable

 * Creating a test configuration was setting PLATFORM, which MsBuild then take into account, wrecking some build options like async code generation.

ManufacturingIntelligence/nhibernate-core,nhibernate/nhibernate-core,hazzik/nhibernate-core,gliljas/nhibernate-core,nhibernate/nhibernate-core,lnu/nhibernate-core,fredericDelaporte/nhibernate-core,RogerKratz/nhibernate-core,RogerKratz/nhibernate-core,nhibernate/nhibernate-core,ManufacturingIntelligence/nhibernate-core,RogerKratz/nhibernate-core,fredericDelaporte/nhibernate-core,ngbrown/nhibernate-core,lnu/nhibernate-core,gliljas/nhibernate-core,gliljas/nhibernate-core,ngbrown/nhibernate-core,hazzik/nhibernate-core,RogerKratz/nhibernate-core,hazzik/nhibernate-core,gliljas/nhibernate-core,lnu/nhibernate-core,ManufacturingIntelligence/nhibernate-core,fredericDelaporte/nhibernate-core,ngbrown/nhibernate-core,hazzik/nhibernate-core,fredericDelaporte/nhibernate-core,nhibernate/nhibernate-core