maint: Eliminate <cfloat.h> header from libinterp files * __contourc__.cc, __qp__.cc, data.cc, graphics.cc, load-save.cc, ls-hdf5.cc, ls-mat-ascii.cc, ls-mat4.cc, ls-mat5.cc, ls-oct-binary.cc, ls-oct-text.h, mappers.cc, mex.cc, pr-output.cc, sysdep.cc, variables.h, xnorm.cc, __glpk__.cc: Remove "#include <cfloat>". Add "#include <limits>" if necessary. Remove redundant #includes. Alphabetize #includes.

--- a/libinterp/corefcn/ls-oct-text.h	Fri Apr 28 13:52:02 2017 -0400
+++ b/libinterp/corefcn/ls-oct-text.h	Fri Apr 28 11:38:39 2017 -0700
@@ -25,8 +25,7 @@
 
 #include "octave-config.h"
 
-#include <cfloat>
-
+#include <limits>
 #include <sstream>
 #include <string>