Removed mutex support for OSX 10.5

Allow to run from the build directory even if it is not on the path
properly decode subprocess stdout/stderr as UTF-8
Added newlines that were mistakenly left out of print->sys.stdout.wriote() conversion in previous CL
Python 3:
 - fixed error message comparison
 - explicit list creation
Windows:
 - forward/back slash annoyances
 - added stdint.h with definitions for int32_t, int64_t
 - compile_error_files and run_error_files were being appended to improperly

winstuff/stdint.h

@@ -0,0 +1,7 @@
+#ifndef MY_STDINT_H
+#define MY_STDINT_H 1
+
+typedef __int32 int32_t;
+typedef __int64 int64_t;
+
+#endif // MY_STDINT_H