support/dependencies/dependencies.sh: require diagnostics perl package for mosh

Fixes:
http://autobuild.buildroot.net/results/820/820e98b1c126469b1f180f078d102ded43b9c40e/

scripts/Makefile.am of mosh-1.4.0 needs the perl diagnostics module on the host:

make[3]: Entering directory '/home/buildroot/autobuild/instance-2/output-1/build/mosh-1.4.0/scripts'
perl -Mdiagnostics -c ./mosh.pl
Can't locate diagnostics.pm in @INC (you may need to install the diagnostics module) (@INC contains: /home/buildroot/autobuild/instance-2/output-1/host/lib/perl /usr/local/lib64/perl5/5.36 /usr/local/share/perl5/5.36 /usr/lib64/perl5/vendor_perl /usr/share/perl5/vendor_perl /usr/lib64/perl5 /usr/share/perl5).
BEGIN failed--compilation aborted.

So add a check for it in dependencies.sh similar to the other perl modules.

Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
(cherry picked from commit 5be2d9bb621e3f3aa552516c8887a7821ed62788)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

support/dependencies/dependencies.sh

@@ -290,6 +290,10 @@ required_perl_modules="$required_perl_modules ExtUtils::MakeMaker" # Used by hos
 required_perl_modules="$required_perl_modules Thread::Queue" # Used by host-automake
 required_perl_modules="$required_perl_modules FindBin" # Used by (host-)libopenssl
 
+if grep -q ^BR2_PACKAGE_MOSH=y $BR2_CONFIG ; then
+    required_perl_modules="$required_perl_modules diagnostics"
+fi
+
 if grep -q ^BR2_PACKAGE_MPV=y $BR2_CONFIG ; then
     required_perl_modules="$required_perl_modules Math::BigInt"
     required_perl_modules="$required_perl_modules Math::BigRat"