Merge with crew

mercurial/osutil.c

@@ -20,6 +20,11 b''
 #include <unistd.h>
 #endif
 
+// some platforms lack the PATH_MAX definition (eg. GNU/Hurd)
+#ifndef PATH_MAX
+#define PATH_MAX 4096
+#endif
+
 #ifdef _WIN32
 /*
 stat struct compatible with hg expectations