Update MXE dependencies

advanced/cross-compile-silent-dragon-for-windows-with-mxe.md

@@ -9,7 +9,7 @@ sudo apt-get -y install clang g++ build-essential make mingw-w64 git pkg-config
 
 ## Install QT packages
 ```
-sudo apt-get -y install qtdeclarative5-dev qt5-qmake libqt5websockets5-dev qtcreator
+sudo apt-get -y install qtdeclarative5-dev qt5-qmake qt5-default libqt5websockets5-dev qtcreator
 ``` 
 
 ## Install MXE dependencies
@@ -34,6 +34,7 @@ sudo apt-get install \
     libgdk-pixbuf2.0-dev \
     libltdl-dev \
     libgl-dev \
+    libpcre3-dev \
     libssl-dev \
     libtool-bin \
     libxml-parser-perl \
@@ -44,8 +45,10 @@ sudo apt-get install \
     patch \
     perl \
     python3 \
+    python3-distutils \
     python3-mako \
     python3-pkg-resources \
+    python-is-python3 \
     ruby \
     sed \
     unzip \