Remove create-dmg.sh script and use create-dmg directly from CMake

dist/macos/create-dmg.sh.in

@@ -1,24 +0,0 @@
-#!/bin/sh
-
-version="@STRAWBERRY_VERSION_PACKAGE@"
-
-if [ -z "$1" ]; then
-    echo "Usage: $0 <bundle.app> (append)"
-    exit 1
-fi
-
-name=$(basename "$1" | perl -pe 's/(.*).app/\1/')
-bundle_dir="$1"
-temp_dir="dmg/$name"
-if [ -z "$2" ]; then
-  output_file="$name-$version.dmg"
-else
-  output_file="$name-$2-$version.dmg"
-fi
-
-rm -rf "$temp_dir"
-rm -f "$output_file"
-
-mkdir -p "$temp_dir"
-
-/usr/local/bin/create-dmg --volname "$name" --background "@CMAKE_SOURCE_DIR@/dist/macos/dmg_background.png" --app-drop-link 450 218 --icon $bundle_dir 150 218 --window-size 600 450 $output_file $bundle_dir