test(check.rb): assume 64-bit FORM by default

check.rb now assumes FORM is 64-bit when it doesn't say whether 64-bit
or 32-bit. This is a temporary workaround on the master branch.

Author: tueda

check/check.rb

@@ -1139,7 +1139,9 @@ def check
         @wordsize = $1.to_i / 16
       else
         system("#{form_bin} #{frmname}")
-        fatal("failed to get the wordsize of '#{@form}'")
+        warn("failed to get the wordsize of '#{@form}'")
+        warn("assuming wordsize = 4")
+        @wordsize = 4
       end
       # Prepare for mpirun
       if @is_mpi