AOSP: Update Android.bp files.

AOSP: Update Android.bp files.

debugfs now links to a new libext2_support library, which only includes
cstring.c (Android separates other pieces of libsupport into separate
libraries).

e2fsck now builds with -Wno-unused-variable to work around an unused
variable introduced by cabde4999d1d10b6ace32eaddc99699b91e40551.

libext_e2p builds the new ljs.c file, and links to ws2_32 on Windows for
ntohl().

Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Change-Id: I42edce0478f1529f44acdbef1495ec5270e3a61e
From AOSP commit: af14814afe0cb3389ecc4b9e9422bd7e8962e0ed