fix up leftover, incorrect NSIG definitions in arch-specific signal.h

arch/arm/bits/signal.h

@@ -33,7 +33,6 @@ struct sigcontext
 	unsigned long arm_ip, arm_sp, arm_lr, arm_pc;
 	unsigned long arm_cpsr, fault_address;
 };
-#define NSIG      64
 #endif
 
 #endif

arch/i386/bits/signal.h

@@ -42,7 +42,6 @@ struct sigcontext {
 	struct __fpstate *fpstate;
 	unsigned long oldmask, cr2;
 };
-#define NSIG      64
 #endif
 
 #endif

arch/microblaze/bits/signal.h

@@ -35,7 +35,6 @@ struct sigcontext
 	} regs;
 	unsigned long oldmask;
 };
-#define NSIG      64
 #endif
 
 #endif

arch/mips/bits/signal.h

@@ -43,7 +43,6 @@ struct sigcontext
 	unsigned long long sc_mdhi, sc_mdlo;
 	unsigned long sc_hi1, sc_lo1, sc_hi2, sc_lo2, sc_hi3, sc_lo3;
 };
-#define NSIG      64
 #endif
 
 #endif

arch/x86_64/bits/signal.h

@@ -40,7 +40,6 @@ struct sigcontext {
 	struct __fpstate *fpstate;
 	unsigned long __reserved1[8];
 };
-#define NSIG      64
 #endif
 
 #endif