Make clucene build against libc++ (at least the one in Xcode 4.6)

(Note that we don't build successfully against libc++ currently; this
is just a fix for the first issue that I came across when trying.)

Change-Id: If8b594177434e96a8b51c372b26a72236b9b5f5e

clucene/UnpackedTarball_clucene.mk

@@ -24,6 +24,7 @@ $(eval $(call gb_UnpackedTarball_set_patchlevel,clucene,0))
 # http://sourceforge.net/mailarchive/message.php?msg_id=29143260
 $(eval $(call gb_UnpackedTarball_add_patches,clucene,\
 	clucene/patches/clucene-debug.patch \
+	clucene/patches/clucene-libcpp.patch \
 	clucene/patches/clucene-multimap-put.patch \
 	clucene/patches/clucene-narrowing-conversions.patch \
 	clucene/patches/clucene-nullptr.patch \

clucene/patches/clucene-libcpp.patch

+--- src/shared/CLucene/LuceneThreads.h
++++ src/shared/CLucene/LuceneThreads.h
+@@ -7,6 +7,7 @@
+ #ifndef _LuceneThreads_h
+ #define  _LuceneThreads_h
+ 
++#include "CLucene/config/_threads.h"
+ 
+ CL_NS_DEF(util)
+ class CLuceneThreadIdCompare;
+--- src/core/CLucene/util/VoidMap.h
++++ src/core/CLucene/util/VoidMap.h
+@@ -11,8 +11,13 @@
+ #include "CLucene/LuceneThreads.h"
+ 
+ #if defined(_CL_HAVE_TR1_UNORDERED_MAP) && defined(_CL_HAVE_TR1_UNORDERED_SET)
++#ifdef _LIBCPP_VERSION
++	#include <unordered_map>
++	#include <unordered_set>
++#else
+ 	#include <tr1/unordered_map>
+ 	#include <tr1/unordered_set>
++#endif
+ #elif defined(_CL_HAVE_HASH_MAP) && defined(_CL_HAVE_HASH_SET)
+ 	//hashing is all or nothing!
+ 	#include <hash_map>
+--- src/shared/CLucene/config/repl_tchar.h
++++ src/shared/CLucene/config/repl_tchar.h
+@@ -36,8 +36,13 @@
+         #define _tcsncpy wcsncpy //copy a specified amount of one string to another string.
+         #define _tcscat wcscat //copy a string onto the end of the other string
+     		#define _tcsncat wcsncat
++#if defined(_LIBCPP_VERSION) && defined(__APPLE__)
++        #define _tcschr ::wcschr //find location of one character
++        #define _tcsstr ::wcsstr //find location of a string
++#else
+         #define _tcschr wcschr //find location of one character
+         #define _tcsstr wcsstr //find location of a string
++#endif
+         #define _tcslen wcslen //get length of a string
+         #define _tcscmp wcscmp //case sensitive compare two strings
+         #define _tcsncmp wcsncmp //case sensitive compare two strings