add libversion checks to mingw build

build.sh

@@ -2,10 +2,51 @@
 
 set -e
 
+cachedir=.cache
+mkdir -p $cachedir
+
 if [[ ! -d build ]]; then
 	mkdir -p build
 fi
 
+libversion=1
+libVFile="./libversion"
+libdir="./lib"
+currentversion=0
+needsdownload="true"
+
+if [ -f $libVFile ]; then 
+    while read line; do    
+        currentversion=$line  
+        continue 
+    done < $libVFile
+fi
+
+if [ $currentversion -ge $libversion ]; then
+    needsdownload="false"
+fi
+
+if [ ! -d $libdir ]; then
+    needsdownload="true"    
+fi
+    
+if [[ "$needsdownload" = "true" ]]; then
+    echo "New libraries need to be downloaded, the script might ask you for sudo access password"
+    rm -rf ./lib
+    if [[ -f $cachedir/orctlibs.zip ]]; then 
+        rm -rf $cachedir/orctlibs.zip
+    fi
+    if [[ -d /usr/local/cross-tools/orctlibs ]]; then
+        sudo rm -rf /usr/local/cross-tools/orctlibs
+    fi
+    curl https://download.openrct2.website/dev/lib/mingw -o $cachedir/orctlibs.zip;
+    sudo mkdir -p /usr/local/cross-tools/orctlibs
+    mkdir -p lib
+    sudo cp -rf $cachedir/orctlibs/glob/* /usr/local/cross-tools/orctlibs/.
+    cp -rf $cachedir/orctlibs/local/* ./lib/. 
+    echo $libversion > $libVFile
+fi
+
 pushd build
 	cmake -DCMAKE_TOOLCHAIN_FILE=../CMakeLists_mingw.txt -DCMAKE_BUILD_TYPE=Debug  ..
 	make