tests: don't install vapi_c{,pp}_test

Don't install vapi_c{,pp}_test. It confuses dpkg-shlibdeps to think we
need libsubunit as shared lib dependency

Type: fix
Fixes: a2d6d352c6926d2f8d4e50aeb1ec59802f32b37b
Signed-off-by: d-valter@yandex-team.ru
Change-Id: Ifb702a61be32b37e79b48780cc61cb0838e87153
diff --git a/src/vpp-api/vapi/CMakeLists.txt b/src/vpp-api/vapi/CMakeLists.txt
index df5d611..e016922 100644
--- a/src/vpp-api/vapi/CMakeLists.txt
+++ b/src/vpp-api/vapi/CMakeLists.txt
@@ -94,6 +94,7 @@
     vapi_c_test.c
     DEPENDS fake_api_vapi_h
     LINK_LIBRARIES ${libs}
+    NO_INSTALL
   )
 
   enable_language(CXX)
@@ -102,6 +103,7 @@
     vapi_cpp_test.cpp
     DEPENDS fake_api_vapi_hpp
     LINK_LIBRARIES ${libs}
+    NO_INSTALL
   )
 
 else()