NetBSD: Delete items from the semver file that don't exist

Some of these may have been removed. `NI_MAXHOST` is already specified
in the unix semver file.

Author: tgross35

libc-test/semver/netbsd.txt

@@ -93,7 +93,6 @@ AT_SUN_IFLUSH
 AT_SUN_LDELF
 AT_SUN_LDNAME
 AT_SUN_LDSHDR
-AT_SUN_LPGSIZE
 AT_SUN_PLATFORM
 AT_SYMLINK_FOLLOW
 AT_SYMLINK_NOFOLLOW
@@ -734,7 +733,6 @@ NET_RT_OOIFLIST
 NET_RT_OOOIFLIST
 NEW_TIME
 NI_DGRAM
-NI_MAXHOST
 NI_MAXSERV
 NI_NAMEREQD
 NI_NOFQDN
@@ -845,7 +843,6 @@ POSIX_SPAWN_RETURNERROR
 POSIX_SPAWN_SETPGROUP
 POSIX_SPAWN_SETSCHEDPARAM
 POSIX_SPAWN_SETSCHEDULER
-POSIX_SPAWN_SETSIGDEP
 POSIX_SPAWN_SETSIGMASK
 PROT_MPROTECT
 PTHREAD_CREATE_DETACHED
@@ -1342,7 +1339,6 @@ futimes
 getbootfile
 getbyteorder
 getdiskrawname
-getdistcookedname
 getdomainname
 getdtablesize
 getentropy
@@ -1422,7 +1418,6 @@ lcong48
 lgetxattr
 lio_listio
 listxattr
-llistxaatr
 localeconv_l
 lockf
 login