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[libvirt] [PATCH] build: skip virportallocatortest on cygwin

Cygwin supports <dlfcn.h> and even has limited LD_PRELOAD
capabilities; but because it does not use ELF binaries it
cannot support RTLD_NEXT lookups.

  CC       libvirportallocatormock_la-virportallocatortest.lo
virportallocatortest.c: In function 'init_syms':
virportallocatortest.c:47:24: error: 'RTLD_NEXT' undeclared (first use in this function)
     realsocket = dlsym(RTLD_NEXT, "socket");

* tests/virportallocatortest.c: Also require RTLD_NEXT.

Signed-off-by: Eric Blake <eblake redhat com>

Pushing under the build-breaker rule.

 tests/virportallocatortest.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tests/virportallocatortest.c b/tests/virportallocatortest.c
index 34843e3..5a93dad 100644
--- a/tests/virportallocatortest.c
+++ b/tests/virportallocatortest.c
@@ -23,7 +23,7 @@
 #include "virfile.h"
 #include "testutils.h"

+#if HAVE_DLFCN_H && defined(RTLD_NEXT)

 # ifdef MOCK_HELPER
 #  include "internal.h"

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