[Bug 244234] devel/valgrind: Fix build with clang 10.0.0

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=244234

            Bug ID: 244234
           Summary: devel/valgrind: Fix build with clang 10.0.0
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: Individual Port(s)
          Assignee: zeising at FreeBSD.org
          Reporter: dim at FreeBSD.org
             Flags: maintainer-feedback?(zeising at FreeBSD.org)
          Assignee: zeising at FreeBSD.org

Created attachment 211765
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=211765&action=edit
Fix compiler version detection hopefully forever

Every time a compiler major version is bumped, we run into this exact
same error:

===>  Configuring for valgrind-3.10.1.20160113_7,1
...
checking for a supported version of gcc... no (10.0.0)
configure: error: please use gcc >= 3.0 or clang >= 2.9

Attempt to fix this for all versions in the future.

Other fix included: don't use undefined behavior to implement offsetof,
just use the official builtin function instead.

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