Replace the GNU gzip with a slightly modified NetBSD gzip. The

NetBSD version is a feature-to-feature re-implementation of GNU
gzip using the freely-redistributable zlib and this version is
expected to be mostly bug-to-bug compatible with the GNU
implementation.

 - Because this is a piece of mature code and we want to make
   changes so it is added directly rather than importing to
   src/contrib.
 - Connect newly added code to src/usr.bin/ and rescue/rescue
   build.
 - Disconnect the GNU gzip code from build for now, they will
   be eventually removed completely.
 - Provide two new src.conf(5) knobs, WITHOUT_BZIP2_SUPPORT and
   WITHOUT_BZIP2.

Tested by:	kris (full exp-7 pointyhat build)
Approved by:	core (importing a 4-clause BSD licensed file)
Approved by:	re (adding new utility during -HEAD code slush)

2 files changed, 5 insertions, 0 deletions

diff --git a/tools/build/options/WITHOUT_BZIP2 b/tools/build/options/WITHOUT_BZIP2
new file mode 100644
index 0000000..baf7125
--- /dev/null
+++ b/tools/build/options/WITHOUT_BZIP2
@@ -0,0 +1,3 @@
+.\" $FreeBSD$
+Set to not build contributed bzip2 software as a part of the base system.
+.Sy "The option has no effect yet."
diff --git a/tools/build/options/WITHOUT_BZIP2_SUPPORT b/tools/build/options/WITHOUT_BZIP2_SUPPORT
new file mode 100644
index 0000000..12b1c7b
--- /dev/null
+++ b/tools/build/options/WITHOUT_BZIP2_SUPPORT
@@ -0,0 +1,2 @@
+.\" $FreeBSD$
+Set to build some programs without optional bzip2 support.