[API diff] Ignore the bcl autogenerated csproj. (#6715)

Related issue: https://github.com/xamarin/xamarin-macios/issues/6162

.gitignore

@@ -19,6 +19,13 @@ jenkins-results
 .vs
 *.raw
 bcl-test-importer
-tests/bcl-test/BCLTests/generated
 tests/xharness/System.ValueTuple.xml
 provisionator.msbuild.props
+# ignore autogenerated bcl tests until they are move to the generated dir
+tests/bcl-test/BCLTests/generated
+tests/bcl-test/generated
+tests/bcl-test/BCL\ tests\ group*.csproj
+tests/bcl-test/Mac\ OS\ X\ BCL\ \tests*.csproj
+tests/bcl-test/mscorlib-mac-full.csproj
+tests/bcl-test/mscorlib-mac-modern.csproj
+tests/bcl-test/mscorlib.csproj