When /etc/ld.so.cache is writeable by user running bitbake then it creates invalid cache 
(in my case libstdc++.so cannot be found after building zlib(-native) and I have to call 
touch */libstdc++.so && /sbin/ldconfig to fix it.

So remove ldconfig call from make install-libs

Upstream-Status: Inappropriate [disable feature]

diff -uNr zlib-1.2.6.orig/Makefile.in zlib-1.2.6/Makefile.in
--- zlib-1.2.6.orig/Makefile.in	2012-01-28 23:48:50.000000000 +0100
+++ zlib-1.2.6/Makefile.in	2012-02-13 15:38:20.577700723 +0100
@@ -199,7 +199,6 @@
 	  rm -f $(DESTDIR)$(sharedlibdir)/$(SHAREDLIB) $(DESTDIR)$(sharedlibdir)/$(SHAREDLIBM); \
 	  ln -s $(SHAREDLIBV) $(DESTDIR)$(sharedlibdir)/$(SHAREDLIB); \
 	  ln -s $(SHAREDLIBV) $(DESTDIR)$(sharedlibdir)/$(SHAREDLIBM); \
-	  ($(LDCONFIG) || true)  >/dev/null 2>&1; \
 	fi
 	cp zlib.3 $(DESTDIR)$(man3dir)
 	chmod 644 $(DESTDIR)$(man3dir)/zlib.3