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Compute cJSON_Version() at compile time #858

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Hello,

As CJSON_VERSION_... macros are known to be constant integers, it is possible to use C macros to transform them to literal strings and to directly use the result in function cJSON_Version.

As a side-effect, this makes cJSON_Version thread-safe, as a there is no longer a shared buffer (static char version[15]) shared between threads.

As CJSON_VERSION_... macros are known to be constant integers, it is
possible to use C macros to transform them to literal strings and to
directly use the result in function cJSON_Version.

As a side-effect, this makes cJSON_Version thread-safe, as a there is no
longer a shared buffer (static char version[15]) shared between threads.
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