[regex] Provide a default definition of SIZE_MAX

[Paolo Bonzini]

regex is currently using SIZE_MAX.  However, first of all this is 
relying on stdint.h being included implicitly (via other headers) 
because that's where SIZE_MAX is defined.  Second, regex cannot rely on 
C99 headers.  This patch fixes this problem by providing a default 
definition of this macro.

Paolo
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