Avoid running Makefile.main ::build ::tests on web

The purpose of Makefile.web is to test and build
Lookout web, but it was also testing and building
the whole Lookout because Makefile.web includes
Makefile, and that one includes src-d/ci/Makefile.main

This commit overrides Makefile.main::build,
Makefile.main::test and Makefile.main::dependencies
targets to avoid calling them when using Makefile.web

Signed-off-by: David Pordomingo <[email protected]>

Makefile.web

@@ -2,13 +2,19 @@
 
 -include Makefile
 
-# Makefile.main::test -> this::test
+# The @echo replaces the commands defined by `Makefile.main::$(COMMANDS)`
+$(COMMANDS):
+	@echo
+
+# The @echo replaces the commands defined by `Makefile.main::dependencies`
+dependencies:
+	@echo
+
+# The @echo replaces the commands defined by `Makefile.main::test`
 test: web-test
+	@echo
 
-# this::build -> Makefile.main::build -> Makefile.main::$(COMMANDS)
-# The @echo forces this prerequisites to be run before `Makefile.main::build` ones.
 build: web-build web-pack
-	@echo
 
 # To be used as -tags
 WITH_STATIC_TAG := with_static