Update lzma_sdk sources to 15.14.

third_party/lzma_sdk/7zAlloc.h

Index: third_party/lzma_sdk/7zAlloc.h
diff --git a/third_party/lzma_sdk/7zAlloc.h b/third_party/lzma_sdk/7zAlloc.h
index 3344e9373f7aca73135254f1505f1e5f09ab8b20..2fd5bdbc80016112aba25c5026e0337795285c24 100644
--- a/third_party/lzma_sdk/7zAlloc.h
+++ b/third_party/lzma_sdk/7zAlloc.h
@@ -1,15 +1,23 @@
 /* 7zAlloc.h -- Allocation functions
-2010-10-29 : Igor Pavlov : Public domain */
+2013-03-25 : Igor Pavlov : Public domain */
 
 #ifndef __7Z_ALLOC_H
 #define __7Z_ALLOC_H
 
 #include <stdlib.h>
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 void *SzAlloc(void *p, size_t size);
 void SzFree(void *p, void *address);
 
 void *SzAllocTemp(void *p, size_t size);
 void SzFreeTemp(void *p, void *address);
 
+#ifdef __cplusplus
+}
+#endif
+
 #endif