c_fcr0 was missing, and segattach() should be _SEGATTACH.

Reference: /n/atom/patch/applied2013/rbapeap2
Date: Wed Jul 31 19:15:06 CES 2013
Signed-off-by: quanstro@quanstro.net

--- /sys/src/ape/lib/ap/mips/c_fcr0.s	Thu Jan  1 00:00:00 1970
+++ /sys/src/ape/lib/ap/mips/c_fcr0.s	Wed Jul 31 19:14:37 2013
@@ -0,0 +1,3 @@
+	TEXT	C_fcr0(SB), $0
+	MOVW	FCR0, R1
+	RET
--- /sys/src/ape/lib/ap/mips/lock.c	Wed Jul 31 19:14:38 2013
+++ /sys/src/ape/lib/ap/mips/lock.c	Wed Jul 31 19:14:38 2013
@@ -32,7 +32,7 @@
 	switch(arch) {
 	case POWER:
 		v = (void*)Lockaddr;
-		if(segattach(SG_CEXEC, "lock", v, Pagesize) == (void*)-1) {
+		if(_SEGATTACH(SG_CEXEC, "lock", v, Pagesize) == (void*)-1) {
 			arch = MAGNUM;
 			break;
 		}