[boost] [build] Building library with vc++ 64-bit does not find vcvarsall.bat

If I build any library with any version vc++ 64-bit compiler, by using address-model=64, the vcvarsall.bat is looked for at, for example with msvc-14.0, C:/Program Files (x86)/Microsoft Visual Studio 14.0/VC/bin/vcvarsall.bat and is not found. Naturally this leads to basic compilation failures. The path for vcvarsall.bat for msvc-14.0 is C:/Program Files (x86)/Microsoft Visual Studio 14.0/VC/vcvarsall.bat instead. All versions of vc++ follow this path structure for vcvarsall.bat Building with any version of vc++ 32-bit, by not specifying the address-model, works correctly.