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Treat Hammerhead like Solaris/illumos in the os-layer meson build.

Meson derives host_machine.system() from uname sysname, which on Hammerhead
is "hammerhead", not "sunos". The os/ static library's Solaris branch (which
adds -lsocket/-lnsl and the _XOPEN_SOURCE/__EXTENSIONS__ defines needed for
struct msghdr.msg_control and the XPG socket API) therefore never fires,
producing undefined socket()/gethostbyname() symbols at link time. Hammerhead
IS illumos, so extend the guard to match its sysname.

--- a/os/meson.build
+++ b/os/meson.build
@@ -63,7 +63,7 @@
 os_c_args = []
 
 # eg. struct msghdr -> msg_control 
-if host_machine.system() == 'sunos'
+if host_machine.system() == 'sunos' or host_machine.system() == 'hammerhead'
     os_c_args += '-D_XOPEN_SOURCE=1'
     os_c_args += '-D_XOPEN_SOURCE_EXTENDED=1'
     os_c_args += '-D__EXTENSIONS__'