Initial softfloat port from Bochs to 86box, currently selectable only on QT.

src/qt/qt_settingsmachine.ui

@@ -200,6 +200,19 @@
      </property>
     </widget>
    </item>
+   <item>
+    <widget class="QCheckBox" name="checkBoxFPUSoftfloat">
+     <property name="sizePolicy">
+      <sizepolicy hsizetype="Minimum" vsizetype="Fixed">
+       <horstretch>3</horstretch>
+       <verstretch>3</verstretch>
+      </sizepolicy>
+     </property>
+     <property name="text">
+      <string>Softfloat FPU</string>
+     </property>
+    </widget>
+   </item>
    <item>
     <widget class="QGroupBox" name="groupBox">
      <property name="sizePolicy">