[Bug 218562] graphics/dri: typo in BSD sed fix from Mesa 17.1

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=218562

            Bug ID: 218562
           Summary: graphics/dri: typo in BSD sed fix from Mesa 17.1
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Keywords: patch, regression
          Severity: Affects Only Me
          Priority: ---
         Component: Individual Port(s)
          Assignee: x11 at FreeBSD.org
          Reporter: jbeich at FreeBSD.org
            Blocks: 217016
             Flags: maintainer-feedback?(x11 at FreeBSD.org)
          Assignee: x11 at FreeBSD.org

Created attachment 181681
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=181681&action=edit
v0

Despite discussion in bug 217016 my patch there was discarded in favor of
manually backporting upstream change and making the same mistake upstream did.
configure.ac has to be preprocessed by autoconf in order to remove extra [...]
symbols used for quoting character list. Doing so would properly strip -f*
flags including -fno-exceptions.

  $ llvm-config40 --cxxflags | sed -E ... -e
's/[[[:space:]]]+-f[[^[:space:]]]*//g' ...

vs.

  $ llvm-config40 --cxxflags | sed -E ... -e 's/[[:space:]]+-f[^[:space:]]*//g'
...


Referenced Bugs:

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=217016
[Bug 217016] graphics/libGL: update to 17.0.3 to get llvm40 support
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