[tlbuild] Linking problem with pplib

[Ken Brown]

I just did a test build on Cygwin and got "undefined reference" errors when 
linking luatex, luahbtex, and xetex.  The problem is that pplib uses symbols 
defined by zlib but appears after it on the link command line.  The attached 
patch fixes the problem.

Ken
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diff --git a/texk/web2c/luatexdir/am/luatex.am b/texk/web2c/luatexdir/am/luatex.am
index bf2065978..93333ba58 100644
--- a/texk/web2c/luatexdir/am/luatex.am
+++ b/texk/web2c/luatexdir/am/luatex.am
@@ -95,11 +95,11 @@ luahbtex_LDFLAGS = -export-dynamic
 luajithbtex_LDFLAGS = -export-dynamic $(LUAJIT_LDEXTRA)
 
 luatex_postldadd = libmplibcore.a 
-luatex_postldadd += $(ZZIPLIB_LIBS) $(LIBPNG_LIBS) $(ZLIB_LIBS)  $(PPLIB_LIBS)
+luatex_postldadd += $(ZZIPLIB_LIBS) $(LIBPNG_LIBS) $(PPLIB_LIBS) $(ZLIB_LIBS)
 luatex_postldadd += $(LDADD) libmputil.a libunilib.a libmd5.a $(lua_socketlibs)
 
 luahbtex_postldadd = libmplibcore.a 
-luahbtex_postldadd += $(ZZIPLIB_LIBS) $(LIBPNG_LIBS) $(ZLIB_LIBS) $(HARFBUZZ_LIBS) $(GRAPHITE2_LIBS) $(PPLIB_LIBS)
+luahbtex_postldadd += $(ZZIPLIB_LIBS) $(LIBPNG_LIBS) $(HARFBUZZ_LIBS) $(GRAPHITE2_LIBS) $(PPLIB_LIBS) $(ZLIB_LIBS)
 luahbtex_postldadd += $(LDADD) libmputil.a libunilib.a libmd5.a $(lua_socketlibs)
 
 
diff --git a/texk/web2c/xetexdir/am/xetex.am b/texk/web2c/xetexdir/am/xetex.am
index 04e7f9ca9..ec34981a1 100644
--- a/texk/web2c/xetexdir/am/xetex.am
+++ b/texk/web2c/xetexdir/am/xetex.am
@@ -39,8 +39,8 @@ xetex_ldadd += $(ICU_LIBS) $(ICU_LIBS_EXTRA)
 xetex_ldadd += $(TECKIT_LIBS)
 xetex_ldadd += $(LIBPNG_LIBS)
 xetex_ldadd += $(FREETYPE2_LIBS)
-xetex_ldadd += $(ZLIB_LIBS)
 xetex_ldadd += $(PPLIB_LIBS)
+xetex_ldadd += $(ZLIB_LIBS)
 xetex_ldadd += libmd5.a
 xetex_dependencies = $(proglib)
 xetex_dependencies += $(KPATHSEA_DEPEND)