Remove prefix support

I spoke with the prefix team sometime back and was told that they do not
have an interest in using OpenRC on prefix systems.

src/librc/librc.c

@@ -216,7 +216,6 @@ rc_sys_v2(void)
 		}
 		/* Now do detection */
 		__STRING_SWITCH(systype)
-		__STRING_CASE(RC_SYS_PREFIX)	{ return RC_SYS_PREFIX; }
 #ifdef __FreeBSD__
 		__STRING_CASE(RC_SYS_JAIL) { return RC_SYS_JAIL; }
 #endif /* __FreeBSD__ */
@@ -246,10 +245,6 @@ librc_hidden_def(rc_sys_v2)
 const char *
 rc_sys_v1(void)
 {
-#ifdef PREFIX
-	return RC_SYS_PREFIX;
-#else
-
 #ifdef __FreeBSD__
 	int jailed = 0;
 	size_t len = sizeof(jailed);
@@ -286,7 +281,6 @@ rc_sys_v1(void)
 #endif
 
 	return NULL;
-#endif /* PREFIX */
 }
 librc_hidden_def(rc_sys_v1)
 

src/librc/rc.h.in

@@ -276,7 +276,6 @@ bool rc_service_daemons_crashed(const char *);
 #define RC_SYS_JAIL    "JAIL"
 #define RC_SYS_OPENVZ  "OPENVZ"
 #define RC_SYS_LXC     "LXC"
-#define RC_SYS_PREFIX  "PREFIX"
 #define RC_SYS_UML     "UML"
 #define RC_SYS_VSERVER "VSERVER"
 #define RC_SYS_XEN0    "XEN0"