Fixups for the android/bionic build probes patch. The CFG_* symbols are always defined so if() can use them as compile-time constants, so don't if defined() them. Doing USE_BLAH() around variable definitions opens up the same potential for config-dependent build breaks as #ifdefs do, just make the whole command depend on the symbol for now, factor out the utmpx infrastructure later. The PTY probe was always failing because it used NULL without #including the header that defines it. Substitute 0 instead.

// pending.h - header for pending.c

// password.c
#define MAX_SALT_LEN  20 //3 for id, 16 for key, 1 for '\0'
int read_password(char * buff, int buflen, char* mesg);
int update_password(char *filename, char* username, char* encrypted);