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Fixes a problem with the mismatched calling conventions in apr and log4cxx.
See http://www.mail-archive.com/log4cxx-user@logging.apache.org/msg02671.html
Submitted upstream:

  https://issues.apache.org/jira/browse/LOGCXX-382

diff -NBaur vanilla/src/main/include/log4cxx/helpers/thread.h mingw_cross/src/main/include/log4cxx/helpers/thread.h
--- vanilla/src/main/include/log4cxx/helpers/thread.h	2008-04-01 07:34:26.000000000 +0900
+++ mingw_cross/src/main/include/log4cxx/helpers/thread.h	2011-05-09 11:08:23.123558232 +0900
@@ -23,9 +23,13 @@
 
 #if !defined(LOG4CXX_THREAD_FUNC)
 #if defined(_WIN32)
-#define LOG4CXX_THREAD_FUNC __stdcall
+  #if defined(__MINGW32__)
+    #define LOG4CXX_THREAD_FUNC
+  #else
+    #define LOG4CXX_THREAD_FUNC __stdcall
+  #endif
 #else
-#define LOG4CXX_THREAD_FUNC
+  #define LOG4CXX_THREAD_FUNC
 #endif
 #endif