[DO NOT MERGE] Update FreeType to 2.6.2 + update from 2.6.0 1. Update to a512b0fe7a (several patches past 2.6.2). Major changes include - stem-darkening is OFF for CFF fonts by default - general code tightening - header file location is back to include/freetype (used be include/) 2. A bit more details are added to README.android for the reference. This CL requires a pdfium change (the way it includes FT header files : https://googleplex-android-review.git.corp.google.com/#/c/846889 An AOSP master CL (https://android-review.googlesource.com/#/c/196504/) is ported to mnc-dev. Bug: 24296662 Change-Id: Iec6784838d89098f332e6d1ed79663efd91a8441 Signed-off-by: Jungshik Shin <jungshik@google.com>