[Bug 271533] x11/xorgproto: ensure Xos.h does not define index() as a macro

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=271533

            Bug ID: 271533
           Summary: x11/xorgproto: ensure Xos.h does not define index() as
                    a macro
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: Individual Port(s)
          Assignee: x11@FreeBSD.org
          Reporter: dim@FreeBSD.org
          Assignee: x11@FreeBSD.org
             Flags: maintainer-feedback?(x11@FreeBSD.org)

During the exp-run for clang 16, it turned out that Xos.h defines
index() and rindex() as preprocessor macros, and this causes many
problems with libc++ headers [1]:

  /usr/include/c++/v1/variant:532:39: error: too few arguments provided to
function-like macro invocation
      return __at(__fmatrix, __vs.index()...)(
                                        ^
  /usr/local/include/X11/Xos.h:67:12: note: macro 'index' defined here
  #   define index(s,c) (strchr((s),(c)))
             ^
  /usr/include/c++/v1/variant:813:18: error: too few arguments provided to
function-like macro invocation
      return index() == variant_npos;
                   ^
  /usr/local/include/X11/Xos.h:67:12: note: macro 'index' defined here
  #   define index(s,c) (strchr((s),(c)))
             ^
  /usr/include/c++/v1/variant:817:25: error: expected ';' at end of declaration
list
    constexpr size_t index() const noexcept {
                          ^
  /usr/include/c++/v1/variant:802:9: error: member initializer '__data' does
not name a non-static data member or base class
        : __data(__tag), __index(__variant_npos<__index_t>) {}
          ^~~~~~~~~~~~~
  /usr/include/c++/v1/variant:808:9: error: member initializer '__data' does
not name a non-static data member or base class
          __data(in_place_index<_Ip>, _VSTD::forward<_Args>(__args)...),
          ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  /usr/include/c++/v1/variant:920:23: error: too few arguments provided to
function-like macro invocation
            __rhs.index(),
                        ^
  /usr/local/include/X11/Xos.h:67:12: note: macro 'index' defined here
  #   define index(s,c) (strchr((s),(c)))
             ^

Add defined(__FreeBSD__) to Xos.h's #if block to include <strings.h>
instead, so it will get our regular index() and rindex() declarations
instead. This has also been sent upstream [2].

[1]
<https://pkg-status.freebsd.org/gohan05/data/mainamd64PR271047-default/2023-05-14_19h35m09s/logs/errors/scim-1.4.9_7.log>
[2] <https://gitlab.freedesktop.org/xorg/proto/xorgproto/-/merge_requests/73>

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