remove GCC 4.2.1 build infrastructure

As described in Warner's email message[1] to the FreeBSD-arch mailing
list we have reached GCC 4.2.1's retirement date.  At this time all
supported architectures either use in-tree Clang, or rely on external
toolchain (i.e., a contemporary GCC version from ports).

GCC 4.2.1 was released July 18, 2007 and was imported into FreeBSD later
that year, in r171825.  GCC has served us well, but version 4.2.1 is
obsolete and not used by default on any architecture in FreeBSD.  It
does not support modern C and does not support arm64 or RISC-V.

Thanks to everyone responsible for maintaining, updating, and testing
GCC in the FreeBSD base system over the years.

So long, and thanks for all the fish.

[1] https://lists.freebsd.org/pipermail/freebsd-arch/2020-January/019823.html

PR:		228919
Reviewed by:	brooks, imp
Sponsored by:	The FreeBSD Foundation
Differential Revision:	https://reviews.freebsd.org/D23124

1 files changed, 1 insertions, 3 deletions

diff --git a/tools/build/options/WITHOUT_SYSTEM_COMPILER b/tools/build/options/WITHOUT_SYSTEM_COMPILER
index 01bd89b2f351..2bf999af83e2 100644
--- a/tools/build/options/WITHOUT_SYSTEM_COMPILER
+++ b/tools/build/options/WITHOUT_SYSTEM_COMPILER
@@ -7,6 +7,4 @@ This does not prevent a compiler from being built for installation though,
 only for building one for the build itself.
 The
 .Va WITHOUT_CLANG
-and
-.Va WITHOUT_GCC
-options control those.
+option controls that.