Use -fPIC for NetBSD.

saper · bnoordhuis · commit 07371e581242 · 2016-01-08T20:20:15.000+01:00
Fixes: sass/node-sass#1334 PR-URL: #856 Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
diff --git a/addon.gypi b/addon.gypi
@@ -99,7 +99,8 @@
           '_FILE_OFFSET_BITS=64'
         ],
       }],
-      [ 'OS=="freebsd" or OS=="openbsd" or OS=="solaris" or (OS=="linux" and target_arch!="ia32")', {
+      [ 'OS in "freebsd openbsd netbsd solaris" or \
+         (OS=="linux" and target_arch!="ia32")', {
         'cflags': [ '-fPIC' ],
       }]
     ]
