GetDP: stable incompatible with PETSc/SLEPc 3.5.2
GetDP: stable incompatible with PETSc/SLEPc 3.5.2

- Temporarily fail if building stable against PETSc/SLEPc
- Update sha1
- Update PETSC_ARCH / SLEPC_ARCH.

kozo2/homebrew-science,ge11232002/homebrew-science,andrewjpage/homebrew-science,parcollet/homebrew-science,goxberry/homebrew-science,quantumsteve/homebrew-science,pmelsted/homebrew-science,DabeDotCom/homebrew-science,heuermh/homebrew-science,philippbayer/homebrew-science,maplesond/homebrew-science,pditommaso/homebrew-science,aeantipov/homebrew-science,ahundt/homebrew-science,dpo/homebrew-science,joshbode/homebrew-science