Upgrade libxml2 and its portage dependencies

sys-libs/zlib/files/zlib-1.2.5-lfs-decls.patch

Index: sys-libs/zlib/files/zlib-1.2.5-lfs-decls.patch
diff --git a/sys-libs/zlib/files/zlib-1.2.5-lfs-decls.patch b/sys-libs/zlib/files/zlib-1.2.5-lfs-decls.patch
new file mode 100644
index 0000000000000000000000000000000000000000..8d73430840590461deb20ebdc78f7ea86c670d84
--- /dev/null
+++ b/sys-libs/zlib/files/zlib-1.2.5-lfs-decls.patch
@@ -0,0 +1,15 @@
+http://bugs.gentoo.org/316377
+
+try to unbreak over-eager LFS logic in zlib header
+
+--- zlib-1.2.5/zlib.h
++++ zlib-1.2.5/zlib.h
+@@ -1578,7 +1578,7 @@
+ #  define gzoffset gzoffset64
+ #  define adler32_combine adler32_combine64
+ #  define crc32_combine crc32_combine64
+-#  ifdef _LARGEFILE64_SOURCE
++#  ifndef _LARGEFILE64_SOURCE
+      ZEXTERN gzFile ZEXPORT gzopen64 OF((const char *, const char *));
+      ZEXTERN z_off_t ZEXPORT gzseek64 OF((gzFile, z_off_t, int));
+      ZEXTERN z_off_t ZEXPORT gztell64 OF((gzFile));