Fix semver test for asmjs-unknown-emscripten target

Author: Thomasdezeeuw

libc-test/semver/TODO-unix.txt

@@ -0,0 +1,5 @@
+# These symbols are missing for the targets:
+# * asmjs-unknown-emscripten
+getpwuid_r
+pthread_atfork
+pthread_sigmask

libc-test/semver/unix.txt

@@ -588,7 +588,6 @@ getprotobyname
 getprotobynumber
 getpwnam
 getpwuid
-getpwuid_r
 getservbyname
 getsockname
 getsockopt
@@ -686,7 +685,6 @@ pread
 printf
 protoent
 pselect
-pthread_atfork
 pthread_attr_destroy
 pthread_attr_init
 pthread_attr_setdetachstate
@@ -733,7 +731,6 @@ pthread_rwlockattr_init
 pthread_rwlockattr_t
 pthread_self
 pthread_setspecific
-pthread_sigmask
 pthread_t
 ptrdiff_t
 ptsname