[Android] Workaround for aarch64 NDK bug.

The last NDK roll (r10c-rc1) lost the ability of generating functional
executables. This is a temporary workaround and should go away by the
time r10c-rd3 NDK is rolled.

BUG=

Review URL: https://codereview.chromium.org/556313003

Cr-Commit-Position: refs/heads/master@{#294257}

build/common.gypi

@@ -3947,6 +3947,12 @@
                     'cflags!': [
                        '-fstack-protector',  # stack protector is always enabled on arm64.
                     ],
+                    # This is a workaround for a NDK bug (b/15574841) and
+                    # should be removed by the r10c-rc3 NDK roll.
+                    # Ping primiano@ if you see this after Oct 2014.
+                    'ldflags': [
+                       '-Wl,--dynamic-linker=/system/bin/linker64',
+                    ],
                   }],
                 ],
               }],