Rename macros "release" and "autorelease" to make they are happy with CFStreamClientContext.release

Rename macros 'release' and 'autorelease' to 'ah_release' and 'ah_autorelease'. To make they are happy with CFStreamClientContext.release

struct CFStreamClientContext in CFStream.h

typedef struct {
    CFIndex version;
    void *info;
    void *(*retain)(void *info);
    void (*release)(void *info);
    CFStringRef (*copyDescription)(void *info);
} CFStreamClientContext;