Some minor fixes for MinGW compiler

src/io/file_manager.cpp

@@ -723,7 +723,7 @@ void FileManager::checkAndCreateConfigDir()
             if(!checkAndCreateDirectory(m_user_config_dir))
             {
                 Log::error("[FileManager]", "Can't create config dir '%s"
-                            ", falling back to '.'.", m_user_config_dir);
+                            ", falling back to '.'.", m_user_config_dir.c_str());
                 m_user_config_dir = ".";
             }
         }

src/utils/aligned_array.hpp

@@ -24,7 +24,7 @@
 // btAlignedObjectArray to enable bullet SSE optimisations.
 // On the other hand, std::vector gives much better debugging features.
 // So SSE is disabled in bullet on windows debug
-#if !defined(DEBUG) && (WIN32)
+#if !defined(DEBUG) && defined(WIN32)
 #  undef USE_ALIGNED
 #else
 #  undef  USE_ALIGNED

src/utils/vs.hpp

@@ -3,7 +3,7 @@
  *  so we define the work arounds only for compiler versions before 18.00
  */
 
-#if defined(WIN32) && _MSC_VER < 1800
+#if defined(WIN32) && defined(_MSC_VER) && _MSC_VER < 1800
 #  include <math.h>
 
 #  define isnan _isnan