Rename 32-bit NDK window package to have -x86 suffix

To be consistent with Linux/MacOSX's 32-bit packages names
eg.
    android-ndk-rXX-windows-x86.zip
    android-ndk-rXX-darwin-x86.zip
    android-ndk-rXX-linux-x86.zip

Directories "prebuilt/windows" remain the same w/o
suffix.

Change-Id: Idd93f192f5ef4b91506aaa7952cfe4dc67890b6c
1 file changed