nova: mtd fields are unsigned

Bit 31 (FPU Mtd) got negative expanded when combined with 64bit value.

Detected during work on #1129

base-nova/include/nova/syscall-generic.h

@@ -193,28 +193,28 @@ namespace Nova {
 		public:
 
 			enum {
-				ACDB = 1 << 0,   /* eax, ecx, edx, ebx */
-				EBSD = 1 << 1,   /* ebp, esi, edi */
-				ESP  = 1 << 2,
-				EIP  = 1 << 3,
-				EFL  = 1 << 4,   /* eflags */
-				ESDS = 1 << 5,
-				FSGS = 1 << 6,
-				CSSS = 1 << 7,
-				TR   = 1 << 8,
-				LDTR = 1 << 9,
-				GDTR = 1 << 10,
-				IDTR = 1 << 11,
-				CR   = 1 << 12,
-				DR   = 1 << 13,  /* DR7 */
-				SYS  = 1 << 14,  /* Sysenter MSRs CS, ESP, EIP */
-				QUAL = 1 << 15,  /* exit qualification */
-				CTRL = 1 << 16,  /* execution controls */
-				INJ  = 1 << 17,  /* injection info */
-				STA  = 1 << 18,  /* interruptibility state */
-				TSC  = 1 << 19,  /* time-stamp counter */
-				EFER = 1 << 20,  /* EFER MSR */
-				FPU  = 1 << 31,  /* FPU state */
+				ACDB = 1U << 0,   /* eax, ecx, edx, ebx */
+				EBSD = 1U << 1,   /* ebp, esi, edi */
+				ESP  = 1U << 2,
+				EIP  = 1U << 3,
+				EFL  = 1U << 4,   /* eflags */
+				ESDS = 1U << 5,
+				FSGS = 1U << 6,
+				CSSS = 1U << 7,
+				TR   = 1U << 8,
+				LDTR = 1U << 9,
+				GDTR = 1U << 10,
+				IDTR = 1U << 11,
+				CR   = 1U << 12,
+				DR   = 1U << 13,  /* DR7 */
+				SYS  = 1U << 14,  /* Sysenter MSRs CS, ESP, EIP */
+				QUAL = 1U << 15,  /* exit qualification */
+				CTRL = 1U << 16,  /* execution controls */
+				INJ  = 1U << 17,  /* injection info */
+				STA  = 1U << 18,  /* interruptibility state */
+				TSC  = 1U << 19,  /* time-stamp counter */
+				EFER = 1U << 20,  /* EFER MSR */
+				FPU  = 1U << 31,  /* FPU state */
 
 				IRQ  = EFL | STA | INJ | TSC,
 				ALL  = 0x000fffff & ~CTRL,