Pass -lrt when linking AddressSanitizer, ThreadSanitizer, MemorySanitizer binaries on Linux only (was: AddressSanitizer, everywhere)

BUG=234010
TBR=hans

Review URL: https://codereview.chromium.org/16018009

git-svn-id: http://src.chromium.org/svn/trunk/src/build@202537 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

common.gypi

@@ -3131,6 +3131,12 @@
                   '-Wl,--as-needed',
                 ],
               }],
+              ['_toolset=="target" and OS=="linux"', {
+                'ldflags': [
+                  # http://crbug.com/234010.
+                  '-lrt',
+                ],
+              }],
             ],
           }],
           ['asan==1', {
@@ -3142,8 +3148,6 @@
                 ],
                 'ldflags': [
                   '-fsanitize=address',
-                  # http://crbug.com/234010.
-                  '-lrt',
                 ],
                 'defines': [
                   'ADDRESS_SANITIZER',