[macOS] Added optional code signing capability to the OSX build scripts.

contrib/build-osx/base.sh

@@ -2,6 +2,7 @@
 
 RED='\033[0;31m'
 BLUE='\033[0,34m'
+YELLOW='\033[0;33m'
 NC='\033[0m' # No Color
 function info {
 	printf "\r💬 ${BLUE}INFO:${NC}  ${1}\n"
@@ -10,3 +11,25 @@ function fail {
     printf "\r🗯 ${RED}ERROR:${NC} ${1}\n"
     exit 1
 }
+function warn {
+	printf "\r⚠️  ${YELLOW}WARNING:${NC}  ${1}\n"
+}
+
+function DoCodeSignMaybe { # ARGS: infoName fileOrDirName codesignIdentity
+    infoName="$1"
+    file="$2"
+    identity="$3"
+    deep=""
+    if [ -z "$identity" ]; then
+        # we are ok with them not passing anything -- master script calls us always even if no identity is specified
+        return
+    fi
+    if [ -d "$file" ]; then
+        deep="--deep"
+    fi
+    if [ -z "$infoName" ] || [ -z "$file" ] || [ -z "$identity" ] || [ ! -e "$file" ]; then
+        fail "Argument error to internal function DoCodeSignMaybe()"
+    fi
+    info "Code signing ${infoName}..."
+    codesign -f -v $deep -s "$identity" "$file" || fail "Could not code sign ${infoName}"
+}