foam-extend, sundials: add cmake as a builddep

The sundials doesn't use CMake directly, but it is referenced in the
patch step. I suspect it calls CMake somewhere else in its build system.

var/spack/repos/builtin/packages/foam-extend/package.py

@@ -29,6 +29,7 @@ class FoamExtend(Package):
     depends_on('python')
     depends_on('flex@:2.5.99')
     depends_on('zlib')
+    depends_on('cmake', type='build')
 
     depends_on('scotch ~ metis', when='~ptscotch+scotch')
     depends_on('scotch ~ metis + mpi', when='+ptscotch')

var/spack/repos/builtin/packages/sundials/package.py

@@ -42,6 +42,7 @@ class Sundials(Package):
     variant('openmp',  default=False, description='Enable OpenMP support')
     variant('pthread', default=True,  description='Enable POSIX threads support')
 
+    depends_on('cmake', type='build')
     depends_on('mpi',                when='+mpi')
     depends_on('blas',               when='+lapack')
     depends_on('lapack',             when='+lapack')