Fix compile warnings

1. Remove unused variable line_no to avoid compile warnings.

2. The variables dimension_value_deprecated/fraction_value_deprecated
had been introduced in the year of 2018 and will be removed later. But
now the related information is still used by external modules cronet
and angle. So we use compile flag to suppress the compile warnings.

Bug: n/a
Test: mmm frameworks/base/tools/aapt2, presubmit check.

Merged-In: Iaf1c44409a2bdeff36af5a05df718be4b32caa65
Change-Id: Iaf1c44409a2bdeff36af5a05df718be4b32caa65
Signed-off-by: Jing Mike <jingyangliu@eswincomputing.com>