Add prependListener and prependOnceListener functions

These are expected on some systems. Unclear why.

Fixes #481

lib/build-view.js

@@ -43,6 +43,14 @@ export default class BuildView extends View {
       scrollback: atom.config.get('build.terminalScrollback')
     });
 
+    // On some systems, prependListern and prependOnceListener is expected to exist. Add them until terminal replacement is here.
+    this.terminal.prependListener = (...a) => {
+      this.terminal.addListener(...a);
+    };
+    this.terminal.prependOnceListener = (...a) => {
+      this.terminal.addOnceListener(...a);
+    };
+
     this.terminal.getContent = function () {
       return this.lines.reduce((m1, line) => {
         return m1 + line.reduce((m2, col) => m2 + col[1], '') + '\n';