Update some aosp external projects to 4.2.2_r1.2

external/freetype
external/fsck_msdos
external/genext2fs
external/giflib
external/grub
external/gtest
external/guava
external/jdiff
external/jpeg
external/jsr305
external/libffi

Change-Id: I258e17a4b103ad0eca64ce7ec77d9c4ea687b950