Fixing some json classic.

and sys/src/.gitignore for new generated files
after inclusion of RISCV architecture and the fix
for inadecuate places for amd64 name.

Change-Id: I413e785f9b94b4c23a70d9794ab49d75c5c17e82

sys/src/9/.gitignore

@@ -0,0 +1,13 @@
+/amd64/init.h
+/amd64/init
+/amd64/systab.c
+/boot/bootcpu.c
+/amd64/tags
+/amd64/amd64l.h
+/amd64/harvey
+/amd64/harvey.32bit
+/amd64/harvey.asm
+/amd64/cpu.c
+/amd64/errstr.h
+/amd64/ksyms.map
+/amd64/nvram

sys/src/9/amd64/clean.json

@@ -1,7 +1,7 @@
 {
 	"clean": {
 		"Pre": [
-			"rm -f *.o *.root.c *.out errstr.h init.h init amd64l.h ../boot/libboot.a ../boot/*.o boot*.c"
+			"rm -f *.o *.root.c *.out errstr.h init.h init ../boot/libboot.a ../boot/*.o boot*.c cpu.c"
 		]
 	}
 }

sys/src/9/boot/bootconf.json

@@ -15,7 +15,7 @@
 		],
 		"Post": [
 			"rm *.o *.a",
-			"data2c ramfs_bootcpu_ ../boot/bootcpu.elf.out >> cpu.c"
+			"data2c ramfs_bootcpu_ ../boot/bootcpu.elf.out >> ../$ARCH/cpu.c"
 		],
 		"Program": "bootcpu.elf.out",
 		"Projects": [