Fix Android.mk LOCAL_EXPORT_C_INCLUDE_DIRS generation

We were keeping the original array, and adding duplicates with -I
removed. Instead, only add entries that start with -I, but continue
stripping that off. This removes the -isystem arguments from the NDK
libraries.

Change-Id: I8fd71bbd6b7a051aad7e80a92a05dbdc05a6b87a
1 file changed