blast: remove install workaround
blast: remove install workaround

The patch is already merged upstream and will be present
in release 2.6.0. This removes the need for the install
workaround.

The fails_with llvm block was removed as this
is now deprecated.

Closes #4740.

Signed-off-by: Jonathan Chang <0bd51b8a224feeddb634965eebae512adcd49a8d@gmail.com>

dpo/homebrew-science,pditommaso/homebrew-science,andrewjpage/homebrew-science,quantumsteve/homebrew-science,heuermh/homebrew-science,maplesond/homebrew-science,philippbayer/homebrew-science