Added macos install wkhtmltopdf (#301)

Author: arjunsuresh

script/get-wkhtmltopdf/meta.yaml

@@ -13,13 +13,13 @@ deps:
         - windows
   - tags: get,generic-sys-util,_wkhtmltopdf
     enable_if_env:
-      MLC_HOST_OS_TYPE:
-        - darwin
+      MLC_INSTALL_FROM_PACKAGE_MANAGER:
+        - on
 uid: 67ec874a3dfe4b87
 docker:
   pre_run_cmds:
     - mlc pull repo
 variations:
   with-qt:
     group: qt
-    default: true
+    default: true

script/get-wkhtmltopdf/run-macos.sh

@@ -0,0 +1,7 @@
+#!/bin/bash
+# This script installs wkhtmltopdf on Amazon Linux
+curl -L -o wkhtmltox-0.12.6-1.macos-cocoa.pkg https://github.com/wkhtmltopdf/packaging/releases/download/0.12.6-1/wkhtmltox-0.12.6-1.macos-cocoa.pkg
+${MLC_SUDO} installer -pkg wkhtmltox-0.12.6-1.macos-cocoa.pkg -target /
+
+wkhtmltopdf --version
+test $? -eq 0 || exit $?