While there, cleanup, and sort depends.

When build and run dependencies are the same, there are three ways to
avoid duplicating the list while not adding the framework added
BUILD_DEPENDS to the RUN_DEPENDS.  In order of preference, they are:

1) use RUN_DEPENDS to set BUILD_DEPENDS:

BUILD_DEPENDS=	${RUN_DEPENDS}
RUN_DEPENDS=	foo:bar/baz

2) create another variable and use it:

MY_DEPENDS= foo:bar/baz
BUILD_DEPENDS=	${MY_DEPENDS}
RUN_DEPENDS=	${MY_DEPENDS}

3) use BUILD_DEPENDS to set RUN_DEPENDS and force evaluation:

BUILD_DEPENDS=	foo:bar/baz
RUN_DEPENDS:=	${BUILD_DEPENDS}

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