fix incorrect paths in osx installer build script

Author: robhagemans

packaging/osx/build.sh

@@ -1,6 +1,7 @@
 NAME="pcbasic-$1-osx"
 pyinstaller installer.spec
-hdiutil create -srcfolder PC-BASIC.app -volname "PC-BASIC release $1" $NAME.uncompressed.dmg
+hdiutil create -srcfolder dist/PC-BASIC.app -volname "PC-BASIC release $1" $NAME.uncompressed.dmg
 hdiutil convert $NAME.uncompressed.dmg -format UDZO -imagekey zlib-level=9 -o $NAME.dmg
 rm $NAME.uncompressed.dmg
-rm -rf PC-BASIC.app
+rm -rf dist
+rm -rf build

packaging/osx/installer.spec

@@ -31,5 +31,5 @@ coll = COLLECT(exe,
            name='pcbasic')
 app = BUNDLE(coll,
          name='PC-BASIC.app',
-         icon='/Users/rob/pc-basic/resources/pcbasic.icns')
+         icon='/Users/rob/pc-basic/packaging/osx/pcbasic.icns')