CI: run proxy tests with ctest

Running clar directly on appveyor makes it think the command returned
failure, so it stops the tests. Running it via ctest lets it go through.

CMakeLists.txt

@@ -690,6 +690,8 @@ IF (BUILD_CLAR)
 	# Add a test target which runs the cred callback tests, to be
 	# called after setting the url and user
 	ADD_TEST(libgit2_clar-cred_callback libgit2_clar -v -sonline::clone::cred_callback)
+	ADD_TEST(libgit2_clar-proxy_credentials_in_url libgit2_clar -v -sonline::clone::proxy_credentials_in_url)
+	ADD_TEST(libgit2_clar-proxy_credentials_request libgit2_clar -v	-sonline::clone::proxy_credentials_request)
 ENDIF ()
 
 IF (TAGS)

appveyor.yml

@@ -41,8 +41,8 @@ test_script:
     $env:GITTEST_REMOTE_USER="libgit2test"
     ctest -V -R libgit2_clar-cred_callback
     $env:GITTEST_REMOTE_PROXY_URL = "http://foo:bar@localhost:8080"
-    .\Debug\libgit2_clar.exe -sonline::clone::proxy_credentials_in_url
+    ctest -V -R libgit2_clar-proxy_credentials_in_url
     $env:GITTEST_REMOTE_PROXY_URL = "http://localhost:8080"
     $env:GITTEST_REMOTE_PROXY_USER = "foo"
     $env:GITTEST_REMOTE_PROXY_PASS = "bar"
-    .\Debug\libgit2_clar.exe -sonline::clone::proxy_credentials_request
+    ctest -V -R libgit2_clar-proxy_credentials_request