blas,lapack: use isILP64 instead of is64bit

This is a better name since we have multiple 64-bit things that could
be referred to.

LP64  : integer=32, long=64, pointer=64
ILP64 : integer=64, long=64, pointer=64

pkgs/applications/science/math/sage/sage-env.nix

@@ -54,7 +54,7 @@
 , less
 }:
 
-assert (!blas.is64bit) && (!lapack.is64bit);
+assert (!blas.isILP64) && (!lapack.isILP64);
 
 # This generates a `sage-env` shell file that will be sourced by sage on startup.
 # It sets up various environment variables, telling sage where to find its

pkgs/applications/science/math/sage/sage-with-env.nix

@@ -23,7 +23,7 @@
 }:
 
 # lots of segfaults with (64 bit) blas
-assert (!blas.is64bit) && (!lapack.is64bit);
+assert (!blas.isILP64) && (!lapack.isILP64);
 
 # Wrapper that combined `sagelib` with `sage-env` to produce an actually
 # executable sage. No tests are run yet and no documentation is built.

pkgs/applications/science/math/sage/sagelib.nix

@@ -53,7 +53,7 @@
 , pplpy
 }:
 
-assert (!blas.is64bit) && (!lapack.is64bit);
+assert (!blas.isILP64) && (!lapack.isILP64);
 
 # This is the core sage python package. Everything else is just wrappers gluing
 # stuff together. It is not very useful on its own though, since it will not