libsanitizer: Fix Solaris 11.3 compilation of sanitizer_procmaps_solaris.cpp [PR105531]

The latest libsanitizer import broke Solaris 11.3 bootstrap again, due
to an oversight of mine.  A fix has been committed upstream

	https://reviews.llvm.org/D133556

This patch cherry-picks it.  Tested on Solaris 11.3 and 11.4, SPARC and
x86.

2022-09-23  Rainer Orth  <ro@CeBiTec.Uni-Bielefeld.DE>

	libsanitizer:
	PR sanitizer/105531
	* sanitizer_common/sanitizer_procmaps_solaris.cpp: Cherry-pick
	llvm-project revision 1cd4d63fb9ab0f04c7151911dde0d58b673823de.

libsanitizer/sanitizer_common/sanitizer_procmaps_solaris.cpp

@@ -9,6 +9,8 @@
 // Information about the process mappings (Solaris-specific parts).
 //===----------------------------------------------------------------------===//
 
+// Before Solaris 11.4, <procfs.h> doesn't work in a largefile environment.
+#undef _FILE_OFFSET_BITS
 #include "sanitizer_platform.h"
 #if SANITIZER_SOLARIS
 #  include <fcntl.h>