Fix Linux and Windows cross-build

Jenkinsfile

@@ -16,14 +16,18 @@ pipeline {
             }
         }
 
-        stage('Build Windows') {
+    stage('Build Windows') {
-            steps {
+        steps {
-                sh '''
+            sh '''
-                    mkdir -p build/windows
+                mkdir -p build/windows
-                    x86_64-w64-mingw32-g++ main.cpp -o build/windows/test_app.exe
+                x86_64-w64-mingw32-g++ main.cpp \
-                '''
+                -static \
-            }
+                -static-libgcc \
+                -static-libstdc++ \
+                -o build/windows/test_app.exe
+            '''
         }
+}
 
         stage('Run Linux') {
             steps {