htslib 1.12 (and tidy up test script)
htslib 1.12 (and tidy up test script)

Create our own small test SAM file instead of installing 5.5M of test data
(of which we use only one <1K file).

Signed-off-by: Carlo Cabrera <3ffc397d0e4bded29cb84b56167de54c01e3a55b@users.noreply.github.com>

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