support/dependencies/dependencies.sh: awk is needed by Buildroot

A basic Fedora 42 container does not have 'awk' installed, but it is
needed by Buildroot. First by check-host-python3.sh:

support/dependencies/check-host-python3.sh: line 6: awk: command not found
support/dependencies/check-host-python3.sh: line 19: awk: command not found
support/dependencies/check-host-python3.sh: line 19: awk: command not found

but then even building host-expat assumes awk is available:

config.status: creating Makefile
./config.status: line 1404: awk: command not found
config.status: creating expat.pc
./config.status: line 1404: awk: command not found

Since it's a pretty basic tool, make it part of the tools checked by
dependencies.sh. One minor annoyance is that check-host-python3.sh is
executed *before* dependencies.sh does its thing, so when 'awk' is not
available, we end up seeing:

support/dependencies/check-host-python3.sh: line 6: awk: command not found
support/dependencies/check-host-python3.sh: line 19: awk: command not found
support/dependencies/check-host-python3.sh: line 19: awk: command not found
which: no awk in (/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin)
You must install 'awk' on your build machine
make: *** [support/dependencies/dependencies.mk:27: dependencies] Error 1

It would be nice to have the awk check *before* it gets used in
check-host-python3.sh, but that's a topic for another patch.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
Signed-off-by: Julien Olivain <ju.o@free.fr>
(cherry picked from commit 448ceefa78c74195e82982046e562f6e2a332d70)
Signed-off-by: Thomas Perale <thomas.perale@mind.be>

docs/manual/prerequisite.adoc

@@ -38,6 +38,7 @@ between distributions).
 ** +file+ (must be in +/usr/bin/file+)
 ** +bc+
 ** +findutils+
+** +awk+
 
 * Source fetching tools:
 ** +wget+

support/dependencies/dependencies.sh

@@ -154,7 +154,7 @@ fi
 
 # Check that a few mandatory programs are installed
 missing_progs="no"
-for prog in perl tar wget cpio unzip rsync bc cmp find xargs ${DL_TOOLS} ; do
+for prog in perl tar wget cpio unzip rsync bc cmp find xargs awk ${DL_TOOLS} ; do
 	if ! which $prog > /dev/null ; then
 		echo "You must install '$prog' on your build machine";
 		missing_progs="yes"