check for builtin_expect and define GCC_UNLIKELY
Imported-from: https://svn.code.sf.net/p/dosbox/code-0/dosbox/trunk@2188
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@ -52,6 +52,7 @@
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#define C_DIRECTSERIAL 1
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#define GCC_ATTRIBUTE(x) /* attribute not supported */
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#define GCC_UNLIKELY(x) (x)
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typedef double Real64;
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/* The internal types */
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