[Bug 244233] devel/json-c: Fix build with clang 10.0.0

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=244233

            Bug ID: 244233
           Summary: devel/json-c: Fix build with clang 10.0.0
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: Individual Port(s)
          Assignee: sunpoet at FreeBSD.org
          Reporter: dim at FreeBSD.org
          Assignee: sunpoet at FreeBSD.org
             Flags: maintainer-feedback?(sunpoet at FreeBSD.org)

Created attachment 211764
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=211764&action=edit
Fix -Werror warning from clang 10.0.0

Fix the following -Werror warning from clang 10.0.0:

json_object.c:701:26: error: implicit conversion from 'long long' to 'double'
changes value from 9223372036854775807 to 9223372036854775808
[-Werror,-Wimplicit-int-float-conversion]
                if (jso->o.c_double >= INT64_MAX)
                                    ~~ ^~~~~~~~~
/usr/include/x86/_stdint.h:94:19: note: expanded from macro 'INT64_MAX'
#define INT64_MAX       0x7fffffffffffffffLL
                        ^~~~~~~~~~~~~~~~~~~~

Similar to fixes I made in head, the solution is to cast INT64_MAX to
double before comparing.

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