zlib: export Haiku versionning symbols.

sys-libs/zlib/patches/zlib-1.2.8.patchset

@@ -0,0 +1,24 @@
+From faf76068355cc9169c3b3cc6564a352218ee47d1 Mon Sep 17 00:00:00 2001
+From: Adrien Destugues <pulkomandy@pulkomandy.tk>
+Date: Sun, 28 Aug 2016 18:33:07 +0200
+Subject: zlib: export Haiku shared object symbols
+
+zlib by default hides all symbols starting with _ from its ABI, which
+also hides symbols used for ABI versionning on Haiku. This makes
+runtime_loader complain that it can't identify the version used.
+
+diff --git a/zlib.map b/zlib.map
+index 55c6647..0a6e90e 100644
+--- a/zlib.map
++++ b/zlib.map
+@@ -6,6 +6,7 @@ ZLIB_1.2.0 {
+     inflateBackEnd;
+     inflateBackInit_;
+     inflateCopy;
++    _gSharedObjectHaiku*;
+   local:
+     deflate_copyright;
+     inflate_copyright;
+-- 
+2.7.0
+

sys-libs/zlib/zlib-1.2.8.recipe

@@ -16,6 +16,7 @@ LICENSE="Zlib"
 REVISION="4"
 SOURCE_URI="http://zlib.net/zlib-1.2.8.tar.xz"
 CHECKSUM_SHA256="831df043236df8e9a7667b9e3bb37e1fcb1220a0f163b6de2626774b9590d057"
+PATCHES="zlib-$portVersion.patchset"
 
 ARCHITECTURES="x86_gcc2 x86 x86_64 arm ?ppc"
 SECONDARY_ARCHITECTURES="x86_gcc2 x86"