modes/gcm128.c: harmonize ctx->ghash assignment, shortcut *_ctr32 in OPENSSL_SMALL_FOOTPRINT build, remove undesired reformat artefact and inconsistency in pre-processor logic.
modes/gcm128.c: harmonize ctx->ghash assignment, shortcut *_ctr32
in OPENSSL_SMALL_FOOTPRINT build, remove undesired reformat artefact
and inconsistency in pre-processor logic.

Reviewed-by: Rich Salz <c04971a99e5a9ee80eaab4b1deb37e845b0bd697@openssl.org>

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