Fix problem with PPASSFILE having the literal '${prefix}' prefix

src/pam_panic/config.h.in

@@ -1,9 +0,0 @@
-#ifndef PAM_PANIC_CONFIG_H
-#define PAM_PANIC_CONFIG_H
-
-#define REBOOT "@REBOOT@"
-#define POWEROFF "@POWEROFF@"
-#define CRYPTSETUP "@CRYPTSETUP@"
-#define PPASSFILE "@PPASSFILE@"
-
-#endif

src/pam_panic_pw/config.h.in

@@ -1,6 +0,0 @@
-#ifndef PAM_PANIC_PW_CONFIG_H
-#define PAM_PANIC_PW_CONFIG_H
-
-#define PPASSFILE "@PPASSFILE@"
-
-#endif