libjson-c: update to 0.13.1

Signed-off-by: Deng Qingfang <dengqf6@mail2.sysu.edu.cn>

package/libs/libjson-c/patches/000-libm.patch

@@ -1,8 +1,8 @@
 --- a/configure.ac
 +++ b/configure.ac
-@@ -43,12 +43,6 @@
- AC_FUNC_MALLOC
- AC_FUNC_REALLOC
+@@ -76,12 +76,6 @@ AC_FUNC_VPRINTF
+ AC_FUNC_MEMCMP
+ AC_CHECK_FUNCS([realloc])
  AC_CHECK_FUNCS(strcasecmp strdup strerror snprintf vsnprintf vasprintf open vsyslog strncasecmp setlocale)
 -AC_CHECK_DECLS([INFINITY], [], [], [[#include <math.h>]])
 -AC_CHECK_DECLS([nan], [], [], [[#include <math.h>]])
@@ -10,16 +10,16 @@
 -AC_CHECK_DECLS([isinf], [], [], [[#include <math.h>]])
 -AC_CHECK_DECLS([_isnan], [], [], [[#include <float.h>]])
 -AC_CHECK_DECLS([_finite], [], [], [[#include <float.h>]])
- 
- #check if .section.gnu.warning accepts long strings (for __warn_references)
- AC_LANG_PUSH([C])
+ AC_MSG_CHECKING(for GCC atomic builtins)
+ AC_LINK_IFELSE(
+ [
 --- a/math_compat.h
 +++ b/math_compat.h
-@@ -1,28 +1,9 @@
- #ifndef __math_compat_h
- #define __math_compat_h
+@@ -6,31 +6,9 @@
+  * @brief Do not use, json-c internal, may be changed or removed at any time.
+  */
  
--/* Define isnan and isinf on Windows/MSVC */
+-/* Define isnan, isinf, infinity and nan on Windows/MSVC */
 -
 -#ifndef HAVE_DECL_ISNAN
 -# ifdef HAVE_DECL__ISNAN
@@ -35,12 +35,15 @@
 -# endif
 -#endif
 -
--#ifndef HAVE_DECL_NAN
--#error This platform does not have nan()
+-#ifndef HAVE_DECL_INFINITY
+-#include <float.h>
+-#define INFINITY (DBL_MAX + DBL_MAX)
+-#define HAVE_DECL_INFINITY
 -#endif
 -
--#ifndef HAVE_DECL_INFINITY
--#error This platform does not have INFINITY
+-#ifndef HAVE_DECL_NAN
+-#define NAN (INFINITY - INFINITY)
+-#define HAVE_DECL_NAN
 -#endif
 +#undef isnan
 +#define isnan(x) __builtin_isnan(x)