Use the latest Qt 5.15.2 in Windows cross compiling images

windows-32bit-cross/Dockerfile

@@ -2,5 +2,9 @@ FROM debian:10
 
 RUN apt-get update && \
     apt-get dist-upgrade -y && \
-    apt-get install -y wget make mingw-w64 pkg-config xorg-dev g++ gcc cmake xz-utils lbzip2 patch git qtbase5-dev-tools qt5-default && \
+    apt-get install -y wget make mingw-w64 pkg-config xorg-dev g++ gcc cmake xz-utils lbzip2 patch git && \
     rm -rf /var/lib/apt/lists/*
+
+RUN wget "https://gr-framework.org/downloads/3rdparty/qt5.15.2-linux-x86_64-bin.tar.gz" && \
+    tar -C/usr/local --strip-components=1 -xvf "qt5.15.2-linux-x86_64-bin.tar.gz" && \
+    rm -rf "qt5.15.2-linux-x86_64-bin.tar.gz"

windows-64bit-cross/Dockerfile

@@ -2,5 +2,9 @@ FROM debian:10
 
 RUN apt-get update && \
     apt-get dist-upgrade -y && \
-    apt-get install -y wget make mingw-w64 pkg-config xorg-dev g++ gcc cmake xz-utils lbzip2 patch git qtbase5-dev-tools qt5-default && \
+    apt-get install -y wget make mingw-w64 pkg-config xorg-dev g++ gcc cmake xz-utils lbzip2 patch git && \
     rm -rf /var/lib/apt/lists/*
+
+RUN wget "https://gr-framework.org/downloads/3rdparty/qt5.15.2-linux-x86_64-bin.tar.gz" && \
+    tar -C/usr/local --strip-components=1 -xvf "qt5.15.2-linux-x86_64-bin.tar.gz" && \
+    rm -rf "qt5.15.2-linux-x86_64-bin.tar.gz"