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pc: move ldmxcsr() prototype to fpu.c

--- a/sys/src/9/pc/fns.h

+++ b/sys/src/9/pc/fns.h

@@ -78,7 +78,6 @@

 int	isaconfig(char*, int, ISAConf*);

 void*	kaddr(ulong);

 #define	kmapinval()

-void	ldmxcsr(ulong);

 void	lgdt(ushort[3]);

 void	lldt(ulong);

 void	lidt(ushort[3]);

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

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

@@ -16,6 +16,7 @@

 extern void fpssesave(FPsave*);

 extern void fpx87restore0(FPsave*);

 extern void fpx87save0(FPsave*);

+extern void ldmxcsr(ulong);

 void

 putxcr0(ulong)