ALSA: simplify checking the available version.

Make use of SND_LIB_VERSION instead of SND_LIB_[MAJOR MINOR SUBMINOR]
in order to simplify the tests.

Task-number: QTBUG-51681
Change-Id: Ib9f28ff15ddc643cc426ded3a5779fb4ff651139
Reviewed-by: Dmitry Shachnev <mitya57@gmail.com>
Reviewed-by: Christian Stromme <christian.stromme@theqtcompany.com>
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@theqtcompany.com>