Fix compilation errors uncovered by -Werror=enum-compare

This fixes regression introduced by commit v4.7-111-g9cbc15b.

* syscall.c: Merge all nsyscalls* enums into single enum.
Likewise merge nerrnos*, nsignals*, and nioctlents* into single enums.
diff --git a/syscall.c b/syscall.c
index 5bf2a12..1f8bde1 100644
--- a/syscall.c
+++ b/syscall.c
@@ -162,10 +162,6 @@
 const struct_ioctlent ioctlent0[] = {
 #include "ioctlent.h"
 };
-enum { nsyscalls0 = ARRAY_SIZE(sysent0) };
-enum { nerrnos0 = ARRAY_SIZE(errnoent0) };
-enum { nsignals0 = ARRAY_SIZE(signalent0) };
-enum { nioctlents0 = ARRAY_SIZE(ioctlent0) };
 
 #if SUPPORTED_PERSONALITIES > 1
 static const char *const errnoent1[] = {
@@ -177,10 +173,6 @@
 static const struct_ioctlent ioctlent1[] = {
 # include "ioctlent1.h"
 };
-enum { nsyscalls1 = ARRAY_SIZE(sysent1) };
-enum { nerrnos1 = ARRAY_SIZE(errnoent1) };
-enum { nsignals1 = ARRAY_SIZE(signalent1) };
-enum { nioctlents1 = ARRAY_SIZE(ioctlent1) };
 #endif
 
 #if SUPPORTED_PERSONALITIES > 2
@@ -193,12 +185,48 @@
 static const struct_ioctlent ioctlent2[] = {
 # include "ioctlent2.h"
 };
-enum { nsyscalls2 = ARRAY_SIZE(sysent2) };
-enum { nerrnos2 = ARRAY_SIZE(errnoent2) };
-enum { nsignals2 = ARRAY_SIZE(signalent2) };
-enum { nioctlents2 = ARRAY_SIZE(ioctlent2) };
 #endif
 
+enum {
+	nsyscalls0 = ARRAY_SIZE(sysent0)
+#if SUPPORTED_PERSONALITIES > 1
+	, nsyscalls1 = ARRAY_SIZE(sysent1)
+# if SUPPORTED_PERSONALITIES > 2
+	, nsyscalls2 = ARRAY_SIZE(sysent2)
+# endif
+#endif
+};
+
+enum {
+	nerrnos0 = ARRAY_SIZE(errnoent0)
+#if SUPPORTED_PERSONALITIES > 1
+	, nerrnos1 = ARRAY_SIZE(errnoent1)
+# if SUPPORTED_PERSONALITIES > 2
+	, nerrnos2 = ARRAY_SIZE(errnoent2)
+# endif
+#endif
+};
+
+enum {
+	nsignals0 = ARRAY_SIZE(signalent0)
+#if SUPPORTED_PERSONALITIES > 1
+	, nsignals1 = ARRAY_SIZE(signalent1)
+# if SUPPORTED_PERSONALITIES > 2
+	, nsignals2 = ARRAY_SIZE(signalent2)
+# endif
+#endif
+};
+
+enum {
+	nioctlents0 = ARRAY_SIZE(ioctlent0)
+#if SUPPORTED_PERSONALITIES > 1
+	, nioctlents1 = ARRAY_SIZE(ioctlent1)
+# if SUPPORTED_PERSONALITIES > 2
+	, nioctlents2 = ARRAY_SIZE(ioctlent2)
+# endif
+#endif
+};
+
 #if SUPPORTED_PERSONALITIES > 1
 const struct_sysent *sysent = sysent0;
 const char *const *errnoent = errnoent0;