libsanitizer: fix build on Mac 10.6

[Konstantin Serebryany]

Hi,

Please review a small patch (backport from upstream) for libsanitizer.
We are having difficulties on our side and (likely) won't make a full
libsanitizer merge until early Jan.

Index: libsanitizer/ChangeLog
===================================================================
--- libsanitizer/ChangeLog      (revision 206107)
+++ libsanitizer/ChangeLog      (working copy)
@@ -1,3 +1,9 @@
+2013-12-19  Kostya Serebryany  <kcc@google.com>
+
+        * sanitizer_common/sanitizer_platform_limits_posix.cc:
+       workaround for missing definition of EOWNERDEAD, backport
+       from upstream r196779.
+
 2013-12-06  H.J. Lu  <hongjiu.lu@intel.com>

        * sanitizer_common/sanitizer_platform_limits_posix.h
Index: libsanitizer/sanitizer_common/sanitizer_platform_limits_posix.cc
===================================================================
--- libsanitizer/sanitizer_common/sanitizer_platform_limits_posix.cc
 (revision 206107)
+++ libsanitizer/sanitizer_common/sanitizer_platform_limits_posix.cc
 (working copy)
@@ -760,7 +760,12 @@
   unsigned IOCTL_TIOCSSERIAL = TIOCSSERIAL;
 #endif

+// EOWNERDEAD is not present in some older platforms.
+#if defined(EOWNERDEAD)
   extern const int errno_EOWNERDEAD = EOWNERDEAD;
+#else
+  extern const int errno_EOWNERDEAD = -1;
+#endif
 }  // namespace __sanitizer

 COMPILER_CHECK(sizeof(__sanitizer_pthread_attr_t) >= sizeof(pthread_attr_t));