lzma: add missing headerfile "Alloc.h" (#2539)

packages/l/lzma/xmake.lua

@@ -14,7 +14,7 @@ package("lzma")
             target("lzma")
                 set_kind("$(kind)")
                 add_files("Alloc.c", "LzFind.c",  "Lzma2Dec.c", "Lzma2Enc.c", "LzmaDec.c", "LzmaEnc.c", "LzmaLib.c", "CpuArch.c")
-                add_headerfiles("7zTypes.h", "LzFind.h", "LzHash.h", "Lzma2Dec.h", "Lzma2Enc.h", "LzmaDec.h", "LzmaEnc.h", "LzmaLib.h")
+                add_headerfiles("7zTypes.h", "Alloc.h", "LzFind.h", "LzHash.h", "Lzma2Dec.h", "Lzma2Enc.h", "LzmaDec.h", "LzmaEnc.h", "LzmaLib.h")
                 if is_plat("windows") then
                     add_files("LzFindMt.c", "LzFindOpt.c", "MtCoder.c", "MtDec.c", "Threads.c", "DllSecur.c", "Lzma2DecMt.c")
                     add_headerfiles("LzFindMt.h", "Lzma2DecMt.h")