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bdrewery
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2018-05-08T19:14:50.855523Z
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MFH: r469300 r469389

Add clang60 support

Update howto
 - 11.0+ base can just use WITH_CCACHE_BUILD=yes [1]
 - Remove older advise for libtool which is no longer needed
 - No need for clang unused argument hack anymore

PR:		222765 [1]
Submitted by:	pete@nomadlogic.org [1] (based on)

Approved by:	portmgr (implicit)

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