CI: Enable '-Wshorten-64-to-32' in {Free,Open}BSD build jobs

Author: Explorer09

.github/workflows/ci.yml

@@ -255,6 +255,7 @@ jobs:
               git config --global --add safe.directory /home/runner/work/htop/htop
             run: |
               set -e
+              export CFLAGS='-g -O2 -Wshorten-64-to-32'
               ./autogen.sh
               ./configure --enable-unicode --enable-werror
               gmake -k
@@ -301,6 +302,7 @@ jobs:
               git config --global --add safe.directory /home/runner/work/htop/htop
             run: |
               set -e
+              export CFLAGS='-g -O2 -Wshorten-64-to-32'
               autoconf_version_full=$(pkg_info -Q autoconf |
                 LC_ALL=C sed 's/^autoconf-\([0-9]*\.[0-9]*\)\(p[.0-9]*\)\{0,1\}$/\1\2/p; d' |
                 LC_ALL=C sort -n -r -t . -k 1,1 -k 2,2 |