dependencies: remove useless targets

The dependencies-source, dependencies-clean and dependencies-dirclean
targets are not needed, as long as 'dependencies' is not used in the
<pkg>_DEPENDENCIES of a package.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

support/dependencies/dependencies.mk

@@ -33,14 +33,6 @@ dependencies: HOSTCC=$(HOSTCC_NOCCACHE)
 dependencies: HOSTCXX=$(HOSTCXX_NOCCACHE)
 dependencies: core-dependencies $(DEPENDENCIES_HOST_PREREQ)
 
-dependencies-source:
-
-dependencies-clean:
-	rm -f $(SSTRIP_TARGET)
-
-dependencies-dirclean:
-	true
-
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