ozone: Work around gestures linkage issue with jsoncpp

The gestures library links jsoncpp, which we link statically. Turn off
fatal-warnings while we sort this out.

BUG=351168
TEST=build --board link_freon
TBR=rjkroege

Review URL: https://codereview.chromium.org/292513003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@271687 0039d316-1c4b-4281-b951-d872f2087c98

build/common.gypi

@@ -3176,7 +3176,7 @@
       },
     }],
     # TODO(jochen): Enable this on chromeos on arm. http://crbug.com/356580
-    ['os_posix==1 and disable_fatal_linker_warnings==0 and (chromeos==0 or target_arch!="arm")', {
+    ['os_posix==1 and disable_fatal_linker_warnings==0 and use_evdev_gestures==0 and (chromeos==0 or target_arch!="arm")', {
       'target_defaults': {
         'ldflags': [
           '-Wl,--fatal-warnings',