fix for bug #18267: pthreads library in single-threaded libraries causes dlopen() to fail on HP/UX

  - zlib doesn't need a thread lib.


zlib/Makefile.am:
  fix for bug #18267: pthreads library in single-threaded libraries causes dlopen() to fail on HP/UX
    - zlib doesn't require a thread lib.

zlib/Makefile.am

@@ -18,6 +18,8 @@
 
 INCLUDES=		-I$(top_builddir)/include -I$(top_srcdir)/include
 
+LIBS= $(NON_THREADED_LIBS)
+
 pkglib_LTLIBRARIES=libz.la
 
 libz_la_LDFLAGS= -version-info 3:3:2