repair the bug caused by the -rpath option is not understood by the Microsoft linker

theano/sandbox/cuda/nvcc_compiler.py

@@ -260,6 +260,8 @@ class NVCC_compiler(Compiler):
         preargs2 = []
         for pa in preargs:
             if pa.startswith('-Wl,'):
+                # the -rpath option is not understood by the Microsoft linker
+                if sys.platform != 'win32':
                     preargs1.append('-Xlinker')
                     preargs1.append(pa[4:])
                 continue