Use msvc

use_msvc - Global flag to force the use of VS2005 instead of mingw

Synopsis
host% gridlabd -D use_msvc=TRUE
 * 1) set use_msvc=TRUE

Description
Normally, GridLAB-D uses mingw to compile runtime code in the GLM files. However, when debugging modules using VS2005, it can be helpful to debugging if GridLAB-D uses the runtime compiler instead.