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pc, pc64: fix grub multiboot

It appears that our IDT overlaps with the data structures
passed from grub in multiboot load.

So defer setup of the interrupt table after the multiboot
parameters have been processed.

--- a/sys/src/9/pc/main.c

+++ b/sys/src/9/pc/main.c

@@ -24,8 +24,8 @@

 main(void)

 {

 	mach0init();

-	trapinit0();

 	bootargsinit();

+	trapinit0();

 	ioinit();

 	i8250console();

 	quotefmtinstall();

--- a/sys/src/9/pc64/main.c

+++ b/sys/src/9/pc64/main.c

@@ -176,8 +176,8 @@

 main(void)

 {

 	mach0init();

-	trapinit0();

 	bootargsinit();

+	trapinit0();

 	ioinit();

 	i8250console();

 	quotefmtinstall();

-- 

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