Do not execute ipc tests under MinGW

Signed-off-by: Mikko Koppanen <mkoppanen@php.net>

tests/Makefile.am

@@ -2,26 +2,26 @@ INCLUDES = -I$(top_builddir)/include
 LDADD = $(top_builddir)/src/libzmq.la
 
 noinst_PROGRAMS = test_pair_inproc \
-                  test_pair_ipc \
                   test_pair_tcp \
                   test_reqrep_inproc \
-                  test_reqrep_ipc \
                   test_reqrep_tcp
 
 if !ON_MINGW
-noinst_PROGRAMS += test_shutdown_stress
+noinst_PROGRAMS += test_shutdown_stress \
+                   test_pair_ipc \
+                   test_reqrep_ipc
 endif
 
 test_pair_inproc_SOURCES = test_pair_inproc.cpp testutil.hpp
-test_pair_ipc_SOURCES = test_pair_ipc.cpp testutil.hpp
 test_pair_tcp_SOURCES = test_pair_tcp.cpp testutil.hpp
 
 test_reqrep_inproc_SOURCES = test_reqrep_inproc.cpp testutil.hpp
-test_reqrep_ipc_SOURCES = test_reqrep_ipc.cpp testutil.hpp
 test_reqrep_tcp_SOURCES = test_reqrep_tcp.cpp testutil.hpp
 
 if !ON_MINGW
 test_shutdown_stress_SOURCES = test_shutdown_stress.cpp
+test_pair_ipc_SOURCES = test_pair_ipc.cpp testutil.hpp
+test_reqrep_ipc_SOURCES = test_reqrep_ipc.cpp testutil.hpp
 endif
 
 TESTS = $(noinst_PROGRAMS)