Let soname dictate the ABI and do not check for minor/micro which requires
needless rebuilds after every zlib update. By Ulrich Müller.

https://bugs.gentoo.org/show_bug.cgi?id=310487
http://www.ntg.nl/pipermail/dev-luatex/2012-July/004534.html

--- a/texk/web2c/luatexdir/luazlib/lzlib.c
+++ b/texk/web2c/luatexdir/luazlib/lzlib.c
@@ -549,14 +549,6 @@
 
     /* ====================================================================== */
 
-    /* make sure header and library version are consistent */
-    const char* version = zlibVersion();
-    if (strncmp(version, ZLIB_VERSION, 5))
-    {
-        lua_pushfstring(L, "zlib library version does not match - header: %s, library: %s", ZLIB_VERSION, version);
-        lua_error(L);
-    }
-
     /* create new metatable for zlib compression structures */
     luaL_newmetatable(L, ZSTREAMMETA);
     lua_pushliteral(L, "__index");