ddraw/tests: Fix Android build by replacing log2f(x) with logf(x)/logf(2)

[André Hentschel]

Am 16.03.2017 um 23:23 schrieb Alexandre Julliard:
> André Hentschel <nerv at dawncrow.de> writes:
> 
>> Signed-off-by: André Hentschel <nerv at dawncrow.de>
>> ---
>>  dlls/ddraw/tests/ddraw1.c | 2 +-
>>  dlls/ddraw/tests/ddraw2.c | 2 +-
>>  dlls/ddraw/tests/ddraw4.c | 2 +-
>>  dlls/ddraw/tests/ddraw7.c | 2 +-
>>  4 files changed, 4 insertions(+), 4 deletions(-)
> 
> It builds fine here, are you using an old API version?
> 

Indeed, with ndk r14 (and api version 24) it works, at least until some strange header problems in windowscodecs