Android patch: Include uconfig_local.h

Enable use of uconfig_local.h during compilation of ICU4C,
which is used by libandroidicu library.

libicuuc uses uconfig_local.h to safeguard a condition during compile time.

In libandroidicu the header file defines a few macros to configure
icu4c behaviour such as adding suffix to C functions.

This commit squashes the following three commits:

1. http://r.android.com/838352 -- Android patch: Include uconfig_local.h
2. http://r.android.com/852490 -- Android Patch: Include uconfig_local.h only when building with soong
3. http://r.android.com/854804 -- Android Patch: Fix the comment for UCONFIG_USE_LOCAL

Test: n/a
Change-Id: I96962d6f8a47c155f9b59cc5e3e9a0e5f4c5b88d
1 file changed