Update to bmake-20130330
Merge bmake-20130123Approved by: marcel (mentor)
Merge bmake-20121111Also pay attention to MK_SHARED_TOOLCHAIN.Approved by: marcel (mentor)
Merge bmake-20120831 from vendor/NetBSD/bmake/dist.Provenance: ftp://ftp.netbsd.org/pub/NetBSD/misc/sjg
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