airspyhf 1.6.8 (new formula)
airspyhf 1.6.8 (new formula)

* airspyhf 1.6.8
* fix: license
* fix: license should be put before head
* test with compiled airspyhf.h
* Update Formula/airspyhf.rb
* airspyhf: fix test for Linux

Closes #83855.

Co-authored-by: Carlo Cabrera <3ffc397d0e4bded29cb84b56167de54c01e3a55b@users.noreply.github.com>
Co-authored-by: Michael Cho <4230fd1076c7d7d625b861988786b839a1928ee4@tuta.io>
Signed-off-by: Michael Cho <ad37dc0e034c3938811c0096de6272abd124db31@users.noreply.github.com>
Signed-off-by: Nanda H Krishna <b1c1d8736f20db3fb6c1c66bb1455ed43909f0d8@nandahkrishna.com>
Signed-off-by: BrewTestBot <8a898ee6867e4f2028e63d2a6319b2224641c06c@users.noreply.github.com>

mfikes/homebrew-core,mbcoguno/homebrew-core,cblecker/homebrew-core,adam-moss/homebrew-core,Moisan/homebrew-core,makigumo/homebrew-core,Homebrew/homebrew-core,cblecker/homebrew-core,lemzwerg/homebrew-core,chrisfinazzo/homebrew-core,Moisan/homebrew-core,makigumo/homebrew-core,zyedidia/homebrew-core,nandub/homebrew-core,stgraber/homebrew-core,uyjulian/homebrew-core,mfikes/homebrew-core,nandub/homebrew-core,sjackman/homebrew-core,Homebrew/homebrew-core,mbcoguno/homebrew-core,filcab/homebrew-core,lemzwerg/homebrew-core,uyjulian/homebrew-core,nbari/homebrew-core,sjackman/homebrew-core,nbari/homebrew-core,stgraber/homebrew-core,filcab/homebrew-core,mbcoguno/homebrew-core,chrisfinazzo/homebrew-core,adam-moss/homebrew-core,zyedidia/homebrew-core