bitbake.conf: require lz4 instead of lz4c

With bitbake commit 'bb: compress: use lz4 instead of lz4c' we require
lz4, not lz4c [1].  Going as far back as Ubuntu 16.04/Fedora 25, they
are packaged together so it should be safe to simply adjust the
requirement from lz4c to lz4.

Note that the two are largely the same, but upstream has considered lz4c
deprecated since at least 2018 [2].

1. https://git.openembedded.org/bitbake/commit/?id=907472034b344e4eb73cfd43059a413469f52e1c
2. https://github.com/lz4/lz4/pull/553

(From OE-Core rev: fe167e082cbde1c6d186ecdda531abef610ac2ac)

Signed-off-by: Justin Bronder <jsbronder@cold-front.org>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/conf/bitbake.conf

@@ -517,7 +517,7 @@ HOSTTOOLS += " \
     [ ar as awk basename bash bunzip2 bzip2 cat chgrp chmod chown chrpath cmp comm cp cpio \
     cpp cut date dd diff diffstat dirname du echo egrep env expand expr false \
     fgrep file find flock g++ gawk gcc getconf getopt git grep gunzip gzip \
-    head hostname iconv id install ld ldd ln ls lz4c make md5sum mkdir mkfifo mknod \
+    head hostname iconv id install ld ldd ln ls lz4 make md5sum mkdir mkfifo mknod \
     mktemp mv nm objcopy objdump od patch perl pr printf pwd \
     python3 pzstd ranlib readelf readlink realpath rm rmdir rpcgen sed seq sh \
     sha1sum sha224sum sha256sum sha384sum sha512sum \