build script: introduce argument '-p' to build stable version of MobileVLCKit

Signed-off-by: Felix Paul Kühne <fkuehne@videolan.org>

compileVLCforiOS.sh

@@ -30,7 +30,7 @@ OPTIONS
    -d       Enable Debug
    -n       Skip script steps requiring network interaction
    -l       Skip libvlc compilation
-   -u       Compile unstable version of MobileVLCKit
+   -p       Compile stable version of MobileVLCKit (default unstable)
 EOF
 }
 
@@ -96,7 +96,7 @@ do
          k)
              SDK=$OPTARG
              ;;
-         u)
+         p)
              UNSTABLEVLCKIT=no
              ;;
          ?)