tests: HAVE_NETINET_IN_H was not defined correctly (#127)

Fixes #125
diff --git a/tests/libssh2_config_cmake.h.in b/tests/libssh2_config_cmake.h.in
index 9bab1d5..51461f2 100644
--- a/tests/libssh2_config_cmake.h.in
+++ b/tests/libssh2_config_cmake.h.in
@@ -39,6 +39,7 @@
 #cmakedefine HAVE_INTTYPES_H
 #cmakedefine HAVE_SYS_SOCKET_H
 #cmakedefine HAVE_ARPA_INET_H
+#cmakedefine HAVE_NETINET_IN_H
 #cmakedefine HAVE_WINDOWS_H
 #cmakedefine HAVE_WINSOCK2_H
 #cmakedefine HAVE_SNPRINTF
diff --git a/tests/openssh_fixture.c b/tests/openssh_fixture.c
index 1d791e8..185ef87 100644
--- a/tests/openssh_fixture.c
+++ b/tests/openssh_fixture.c
@@ -47,6 +47,9 @@
 #ifdef HAVE_ARPA_INET_H
 #include <arpa/inet.h>
 #endif
+#ifdef HAVE_NETINET_IN_H
+#include <netinet/in.h>
+#endif
 #ifdef HAVE_UNISTD_H
 #include <unistd.h>
 #endif