reserved by posix, move outta the way.

Reference: /n/atom/patch/applied/fmtzisreserved
Date: Wed Sep  9 06:12:58 CES 2015
Signed-off-by: quanstro@quanstro.net

--- /sys/src/cmd/venti/srv/fixarenas.c	Wed Sep  9 06:12:49 2015
+++ /sys/src/cmd/venti/srv/fixarenas.c	Wed Sep  9 06:12:51 2015
@@ -61,7 +61,7 @@
  * Format number in simplest way that is okay with unittoull.
  */
 static int
-zfmt(Fmt *fmt)
+Zfmt(Fmt *fmt)
 {
 	vlong x;
 	
@@ -612,7 +612,7 @@
 					info->name, u32(want), u32(have));
 				break;
 			case Z|4:
-				print("\t%s: correct=%z disk=%z\n",
+				print("\t%s: correct=%Z disk=%Z\n",
 					info->name, (uvlong)u32(want), (uvlong)u32(have));
 				break;
 			case D|8:
@@ -620,7 +620,7 @@
 					info->name, u64(want), u64(have));
 				break;
 			case Z|8:
-				print("\t%s: correct=%z disk=%z\n",
+				print("\t%s: correct=%Z disk=%Z\n",
 					info->name, u64(want), u64(have));
 				break;
 			case S|ANameSize:
@@ -727,9 +727,9 @@
 				n = 0;
 			}
 		}
-		print("arena size likely %z (%d of %d)\n", bestdiff, bestn, ndiff);
+		print("arena size likely %Z (%d of %d)\n", bestdiff, bestn, ndiff);
 		if(arenasize != 0 && arenasize != bestdiff)
-			print("using user-specified size %z instead\n", arenasize);
+			print("using user-specified size %Z instead\n", arenasize);
 		else
 			arenasize = bestdiff;
 
@@ -763,9 +763,9 @@
 				n = 0;
 			}
 		}
-		print("block size likely %z (%d of %d)\n", bestdiff, bestn, ndiff);
+		print("block size likely %Z (%d of %d)\n", bestdiff, bestn, ndiff);
 		if(ap.blocksize != 0 && ap.blocksize != bestdiff)
-			print("using user-specified size %z instead\n", (vlong)ap.blocksize);
+			print("using user-specified size %Z instead\n", (vlong)ap.blocksize);
 		else
 			ap.blocksize = bestdiff;
 		if(ap.blocksize == 0 || ap.blocksize&(ap.blocksize-1))
@@ -816,7 +816,7 @@
 		}
 	}
 	p = pagein(ap.arenabase, Block);
-	print("arena base likely %z%s\n", (vlong)ap.arenabase, 
+	print("arena base likely %Z%s\n", (vlong)ap.arenabase, 
 		u32(p)!=ArenaHeadMagic ? " (but no arena head there)" : "");
 
 	ap.tabsize = ap.arenabase - ap.tabbase;
@@ -1714,7 +1714,7 @@
 	guessarena(offset, anum, &head, &arena, oldscore, score);
 
 	if(verbose){
-		print("#\tversion=%d name=%s blocksize=%d size=%z",
+		print("#\tversion=%d name=%s blocksize=%d size=%Z",
 			head.version, head.name, head.blocksize, head.size);
 		if(head.clumpmagic)
 			print(" clumpmagic=%#.8ux", head.clumpmagic);
@@ -1833,7 +1833,7 @@
 	s = fmtstrflush(&fmt);
 	len = strlen(s);
 	if(len > ap.tabsize){
-		print("arena partition map too long: need %z bytes have %z\n",
+		print("arena partition map too long: need %Z bytes have %Z\n",
 			(vlong)len, (vlong)ap.tabsize);
 		len = ap.tabsize;
 	}
@@ -1894,7 +1894,7 @@
 	file = argv[0];
 	
 	ventifmtinstall();
-	fmtinstall('z', zfmt);
+	fmtinstall('Z', Zfmt);
 	fmtinstall('t', tfmt);
 	quotefmtinstall();