Debug build pulls assert.h and nrfx, in which PACKAGE define isi pulled from
libsamplerate/serc/config.h. This is not correct behavior and these
defines are not correlated. Library should be always build without
asserts, circumventing the issue.
Cleaned up duplicated cflags in pkg.yml.
`config.h` being in `include` directory meant that it was included
globally. It may cause it being indluded into other package (as global
include)
Added prefixes to libsamplerate syscfg settings.
Krzysztof Kopyściński