Andre Oppermann 14d7c5b11c Improve m_cat() by being able to also merge contents from M_EXT
mbuf's by doing proper testing with M_WRITABLE().

In m_collapse() replace an incomplete manual check for M_RDONLY
with the M_WRITABLE() macro that also tests for shared buffers
and other cases that make a particular mbuf immutable.

MFC after:	2 weeks
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