topology: correct version script path

topology: correct version script path

contrary to libasound, version script for libatopology is a regular
source file. while it's often the case that $(builddir) and $(srcdir)
point to the same directory, they don't always have to. therefore path
needs to point explicitly to $(srcdir) for Versions script in topology

Closes: https://github.com/alsa-project/alsa-lib/pull/383
Fixes: GH-382
Fixes: dc7da761f3a2 ("topology: separate Versions linker script")
Signed-off-by: Jan Palus <jpalus@fastmail.com>
Signed-off-by: Jaroslav Kysela <perex@perex.cz>