Log Message:
Update www/netsurf to 3.4.

Changes:
NetSurf 3.4
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NetSurf 3.4 features many optimisations to improve performance over
previous releases. It also contains many bug fixes, including
improvements to page layout. This is also the first release to
contain the Duktape JavaScript engine.  While our JavaScript bindings
have seen a lot of development for this release, JavaScript remains
disabled by default as the support is incomplete. We recommend all
users upgrade to NetSurf 3.4.