package/wavpack: bump to version 4.75.2

Autoreconf is not necessary anymore.

WavPack "autodetects" CPU type to enable ASM code. However, the assembly code
for ARM is written for ARMv7 only and building WavPack for an ARM-non-v7
architecture will fail. We explicitly enable ASM for the supported
architectures x86, x64 and ARMv7 and disable it for all others.

Signed-off-by: Jörg Krause <joerg.krause@embedded.rocks>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>