[BL] Fix usage of _MSC_VER macro. WIN32 is correct

The enclosed code depends on OS, not compiler.

BaseLib/RunTime.h

@@ -38,7 +38,7 @@ class RunTime
 #if defined(USE_MPI)
             _start_time = MPI_Wtime();
 #else
-#ifndef _MSC_VER
+#ifndef WIN32
             timeval t;
             gettimeofday(&t, nullptr);
             _start_time = t.tv_sec + t.tv_usec/1000000.0;
@@ -54,7 +54,7 @@ class RunTime
 #if defined(USE_MPI)
             return MPI_Wtime() - _start_time;
 #else
-#ifndef _MSC_VER
+#ifndef WIN32
             timeval t;
             gettimeofday(&t, nullptr);
             return t.tv_sec + t.tv_usec/1000000.0 - _start_time;