Organize the include of header files

- `#include <math.h>` is done in `mruby.h`.
  Eliminate the need to worry about the `MRB_NO_FLOAT` macro.

- Include mruby header files before standard header files.
  If the standard header file is already placed before `mruby.h`, the standard header file added in the future tends to be placed before `mruby.h`.

This change should some reduce the chances of macros that must be defined becoming undefined in C++ or including problematic header files in a particular mruby build configuration.

1 files changed, 0 insertions, 1 deletions

diff --git a/mrbgems/mruby-rational/src/rational.c b/mrbgems/mruby-rational/src/rational.c
index 7d099b1e2..dacce53eb 100644
--- a/mrbgems/mruby-rational/src/rational.c
+++ b/mrbgems/mruby-rational/src/rational.c
@@ -155,7 +155,6 @@ rational_new_i(mrb_state *mrb, mrb_int n, mrb_int d)
 }
 
 #ifndef MRB_NO_FLOAT
-#include <math.h>
 
 #if defined(MRB_INT32) || defined(MRB_USE_FLOAT32)
 #define frexp_rat(x,exp) frexpf((float)x, exp)