Fix TCP specs to accept EAI_NODATA instead of EAI_NONAME for unresolvable hostname (#16496)

TCP specs suddenly started failing because DNS resolution returns an unexpected error code.

We're using lookups for `doesnotexist.example.org.` to trigger certain error states, but apparently those have changed from `EAI_NONAME` (name is unknown) to `EAI_NODATA` (name is known but has no address).

Ideally, our spec suite should not depend on external factors like this.
But as a quick fix, we're accepting `EAI_NODATA` as well in the affected specs.

Author: straight-shoota

spec/std/socket/tcp_server_spec.cr

@@ -99,7 +99,7 @@ describe TCPServer, tags: "network" do
         {% elsif flag?(:android) || flag?(:netbsd) || flag?(:openbsd) %}
           err.os_error.should eq(Errno.new(LibC::EAI_NODATA))
         {% else %}
-          [Errno.new(LibC::EAI_NONAME), Errno.new(LibC::EAI_AGAIN)].should contain err.os_error
+          [Errno.new(LibC::EAI_NONAME), Errno.new(LibC::EAI_NODATA), Errno.new(LibC::EAI_AGAIN)].should contain err.os_error
         {% end %}
       end
 
@@ -113,7 +113,7 @@ describe TCPServer, tags: "network" do
         {% elsif flag?(:android) || flag?(:netbsd) || flag?(:openbsd) %}
           err.os_error.should eq(Errno.new(LibC::EAI_NODATA))
         {% else %}
-          [Errno.new(LibC::EAI_NONAME), Errno.new(LibC::EAI_AGAIN)].should contain err.os_error
+          [Errno.new(LibC::EAI_NONAME), Errno.new(LibC::EAI_NODATA), Errno.new(LibC::EAI_AGAIN)].should contain err.os_error
         {% end %}
       end
     end

spec/std/socket/tcp_socket_spec.cr

@@ -86,7 +86,7 @@ describe TCPSocket, tags: "network" do
         {% elsif flag?(:android) || flag?(:netbsd) || flag?(:openbsd) %}
           err.os_error.should eq(Errno.new(LibC::EAI_NODATA))
         {% else %}
-          [Errno.new(LibC::EAI_NONAME), Errno.new(LibC::EAI_AGAIN)].should contain err.os_error
+          [Errno.new(LibC::EAI_NONAME), Errno.new(LibC::EAI_NODATA), Errno.new(LibC::EAI_AGAIN)].should contain err.os_error
         {% end %}
       end
 
@@ -100,7 +100,7 @@ describe TCPSocket, tags: "network" do
         {% elsif flag?(:android) || flag?(:netbsd) || flag?(:openbsd) %}
           err.os_error.should eq(Errno.new(LibC::EAI_NODATA))
         {% else %}
-          [Errno.new(LibC::EAI_NONAME), Errno.new(LibC::EAI_AGAIN)].should contain err.os_error
+          [Errno.new(LibC::EAI_NONAME), Errno.new(LibC::EAI_NODATA), Errno.new(LibC::EAI_AGAIN)].should contain err.os_error
         {% end %}
       end
     end

src/lib_c/aarch64-darwin/c/netdb.cr

@@ -15,6 +15,7 @@ lib LibC
   EAI_FAIL       =          4
   EAI_FAMILY     =          5
   EAI_MEMORY     =          6
+  EAI_NODATA     =          7
   EAI_NONAME     =          8
   EAI_SERVICE    =          9
   EAI_SOCKTYPE   =         10

src/lib_c/aarch64-linux-gnu/c/netdb.cr

@@ -13,6 +13,7 @@ lib LibC
   EAI_AGAIN      =     -3
   EAI_BADFLAGS   =     -1
   EAI_FAIL       =     -4
+  EAI_NODATA     =     -5
   EAI_FAMILY     =     -6
   EAI_MEMORY     =    -10
   EAI_NONAME     =     -2

src/lib_c/aarch64-linux-musl/c/netdb.cr

@@ -13,6 +13,7 @@ lib LibC
   EAI_AGAIN      =    -3
   EAI_BADFLAGS   =    -1
   EAI_FAIL       =    -4
+  EAI_NODATA     =    -5
   EAI_FAMILY     =    -6
   EAI_MEMORY     =   -10
   EAI_NONAME     =    -2

src/lib_c/arm-linux-gnueabihf/c/netdb.cr

@@ -13,6 +13,7 @@ lib LibC
   EAI_AGAIN      =     -3
   EAI_BADFLAGS   =     -1
   EAI_FAIL       =     -4
+  EAI_NODATA     =     -5
   EAI_FAMILY     =     -6
   EAI_MEMORY     =    -10
   EAI_NONAME     =     -2

src/lib_c/i386-linux-gnu/c/netdb.cr

@@ -12,6 +12,7 @@ lib LibC
   AI_ADDRCONFIG  = 0x0020
   EAI_AGAIN      =     -3
   EAI_BADFLAGS   =     -1
+  EAI_NODATA     =     -5
   EAI_FAIL       =     -4
   EAI_FAMILY     =     -6
   EAI_MEMORY     =    -10

src/lib_c/i386-linux-musl/c/netdb.cr

@@ -13,6 +13,7 @@ lib LibC
   EAI_AGAIN      =    -3
   EAI_BADFLAGS   =    -1
   EAI_FAIL       =    -4
+  EAI_NODATA     =    -5
   EAI_FAMILY     =    -6
   EAI_MEMORY     =   -10
   EAI_NONAME     =    -2

src/lib_c/x86_64-darwin/c/netdb.cr

@@ -15,6 +15,7 @@ lib LibC
   EAI_FAIL       =          4
   EAI_FAMILY     =          5
   EAI_MEMORY     =          6
+  EAI_NODATA     =          7
   EAI_NONAME     =          8
   EAI_SERVICE    =          9
   EAI_SOCKTYPE   =         10

src/lib_c/x86_64-dragonfly/c/netdb.cr

@@ -16,6 +16,7 @@ lib LibC
   EAI_FAMILY     =          5
   EAI_MEMORY     =          6
   EAI_NONAME     =          8
+  EAI_NODATA     =          7
   EAI_SERVICE    =          9
   EAI_SOCKTYPE   =         10
   EAI_SYSTEM     =         11