i'm compiling a C++ extension and the smart_str macros are causing MSVC to
spill warnings about converting void* to char *.
Casting the return from the SMART_STR_REALLOC macro seems to fix it.
#ifdef SMART_STR_USE_REALLOC
-#define SMART_STR_REALLOC(a,b,c) realloc((a),(b))
+#define SMART_STR_REALLOC(a,b,c) (char *)realloc((a),(b))
#else
-#define SMART_STR_REALLOC(a,b,c) perealloc((a),(b),(c))
+#define SMART_STR_REALLOC(a,b,c) (char *)perealloc((a),(b))
#endif
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