GTTF: Enable tcmalloc's debugallocation on Windows.

third_party/tcmalloc/chromium/src/config_win.h

 /* A manual version of config.h fit for windows machines. */
 
 /* Sometimes we accidentally #include this config.h instead of the one
    in .. -- this is particularly true for msys/mingw, which uses the
    unix config.h but also runs code in the windows directory.
    */
 #ifdef __MINGW32__
 #include "../config.h"
 #define GOOGLE_PERFTOOLS_WINDOWS_CONFIG_H_
 #endif
@@ skipping 56 matching lines @@
 /* Define to 1 if you have the <dlfcn.h> header file. */
 #undef HAVE_DLFCN_H
 
 /* Define to 1 if the system has the type `Elf32_Versym'. */
 #undef HAVE_ELF32_VERSYM
 
 /* Define to 1 if you have the <execinfo.h> header file. */
 #undef HAVE_EXECINFO_H
 
 /* Define to 1 if you have the <fcntl.h> header file. */
-#undef HAVE_FCNTL_H
+#define HAVE_FCNTL_H 1
 
 /* Define to 1 if you have the <features.h> header file. */
 #undef HAVE_FEATURES_H
 
 /* Define to 1 if you have the `geteuid' function. */
 #undef HAVE_GETEUID
 
 /* Define to 1 if you have the `getpagesize' function. */
 #define HAVE_GETPAGESIZE 1   /* we define it in windows/port.cc */
 
@@ skipping 214 matching lines @@
 # define _WIN32_WINNT 0x0501
 #endif
 
 // We want to make sure not to ever try to #include heap-checker.h
 #define NO_HEAP_CHECK 1
 
 // TODO(csilvers): include windows/port.h in every relevant source file instead?
 #include "windows/port.h"
 
 #endif  /* GOOGLE_PERFTOOLS_WINDOWS_CONFIG_H_ */