[GR-15581] Fix Docker testing.

PullRequest: truffleruby/830

Author: nirvdrum

spec/tags/library/etc/struct_passwd_tags.txt

@@ -1,3 +1,4 @@
 slow:Struct::Passwd returns user name
 slow:Struct::Passwd returns user id
 darwin:Struct::Passwd returns user group id
+slow:Struct::Passwd returns user group id

spec/tags/library/socket/ipsocket/getaddress_tags.txt

@@ -0,0 +1 @@
+fails(spurious):Socket::IPSocket#getaddress raises an error on unknown hostnames

spec/truffle/posix_spec.rb

@@ -12,7 +12,7 @@
   before :all do
     src = fixture __FILE__, "libtestnfi.c"
     lib = src[0...-1] + RbConfig::CONFIG['NATIVE_DLEXT']
-    unless system "cc", "-shared", "-o", lib, src
+    unless system "clang", "-shared", "-o", lib, src
       abort "Could not compile libtestnfi"
     end