Improve NDK_DEBUG_MODULES output.
David 'Digit' Turner authored
This improves the output of the module database when you
define NDK_DEBUG_MODULES=1 when calling ndk-build.

This really means that:

 - only dump the fields that are not empty
 - break multiple field value into several lines
   (it the value only has an item, print it in-line as before).

+ Fix doc typo

Change-Id: Icbdd7fbd0b50bcaab2a18dd3898c732310958992
bb16bc70