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Avoid warning when __STDC_VERSION__ is not defined

This fixes an issue with gcc 4.9 on Debian 8, at least,
which defines __STDC__ but not __STDC_VERSION__, unlike
more recent gcc.

Signed-off-by: Ralph Giles <giles@thaumas.net>

--- a/include/opus_types.h

+++ b/include/opus_types.h

@@ -34,7 +34,7 @@

 #define OPUS_TYPES_H

 /* Use the real stdint.h if it's there (taken from Paul Hsieh's pstdint.h) */

-#if (defined(__STDC__) && __STDC__ && __STDC_VERSION__ >= 199901L) || (defined(__GNUC__) && (defined(_STDINT_H) || defined(_STDINT_H_)) || defined (HAVE_STDINT_H))

+#if (defined(__STDC__) && __STDC__ && defined(__STDC_VERSION__) && __STDC_VERSION__ >= 199901L) || (defined(__GNUC__) && (defined(_STDINT_H) || defined(_STDINT_H_)) || defined (HAVE_STDINT_H))

 #include <stdint.h>

    typedef int16_t opus_int16;