Enable readline on d8 while building a shared lib.

src/d8.gyp

Index: src/d8.gyp
diff --git a/src/d8.gyp b/src/d8.gyp
index a8361e6b4e5eca0cb83c791de8b44fbd85f3bceb..cce8f2a1fb0782738648dd9f09d4fd40b22d14a8 100644
--- a/src/d8.gyp
+++ b/src/d8.gyp
@@ -45,6 +45,10 @@
         'd8.cc',
       ],
       'conditions': [
+        [ 'console=="readline"', {
+          'libraries': [ '-lreadline', ],
+          'sources': [ 'd8-readline.cc' ],
+        }],
         [ 'component!="shared_library"', {
           'sources': [ 'd8-debug.cc', '<(SHARED_INTERMEDIATE_DIR)/d8-js.cc', ],
           'conditions': [
@@ -57,10 +61,6 @@
                 'd8_js2c',
               ],
             }],
-            [ 'console=="readline"', {
-              'libraries': [ '-lreadline', ],
-              'sources': [ 'd8-readline.cc' ],
-            }],
             ['(OS=="linux" or OS=="mac" or OS=="freebsd" or OS=="netbsd" \
                or OS=="openbsd" or OS=="solaris" or OS=="android")', {
               'sources': [ 'd8-posix.cc', ]