Configurations/15-android.conf: refine clang support.
Configurations/15-android.conf: refine clang support.

Adjusting ARM default broke clang support, and x86[_64] needed
path adjustment.

Reviewed-by: Rich Salz <c04971a99e5a9ee80eaab4b1deb37e845b0bd697@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/5613)

openssl/openssl,openssl/openssl,openssl/openssl,openssl/openssl,openssl/openssl,openssl/openssl