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Fix undefined reference to c99_vsnprintf and ts_utf8_sequence_length when using mingw32 gcc.

The mingw32 gcc compiler doesn't treat __inline as Visual C++ does.
Use `static inline` instead of `__inline` for c99_vsnprintf.
Don't use `__inline` for ts_utf8_sequence_length.

--- a/include/cst_file.h

+++ b/include/cst_file.h

@@ -101,7 +101,13 @@

 #ifdef _WIN32

 #define snprintf c99_snprintf

-__inline int c99_vsnprintf(char* str, size_t size, const char* format,

+#ifdef __GNUC__

+#define INLINE static inline

+#else

+#define INLINE __inline

+#endif

+

+INLINE int c99_vsnprintf(char* str, size_t size, const char* format,

 va_list ap)  {

        int count = -1;

        if (size != 0)

@@ -110,7 +116,7 @@

            count = _vscprintf(format, ap);

        return count;

    }

-__inline int c99_snprintf(char* str, size_t size, const char* format, ...)

+INLINE int c99_snprintf(char* str, size_t size, const char* format, ...)

 {

        int count;

        va_list ap;

--- a/include/cst_tokenstream.h

+++ b/include/cst_tokenstream.h

@@ -130,7 +130,7 @@

                                  int (*getc)(cst_tokenstream *ts));

 void ts_close(cst_tokenstream *ts);

-#ifdef _WIN32

+#if defined(_WIN32) && !defined(__GNUC__)

 __inline int ts_utf8_sequence_length(char c0);

 #else

 int ts_utf8_sequence_length(char c0);

--- a/src/utils/cst_tokenstream.c

+++ b/src/utils/cst_tokenstream.c

@@ -266,7 +266,7 @@

     (*buffer)[p] = '\0';

 }

- #ifdef _WIN32

+ #if defined _WIN32 && !defined(__GNUC__)

  __inline int ts_utf8_sequence_length(char c0)

  #else

  int ts_utf8_sequence_length(char c0)