Update build version in the manifest

Change-Id: Ie8a5dfd682fdb2ede062606cefb4f5aa20e20215
diff --git a/manifest/ffmpeg b/manifest/ffmpeg
index adc5ae7..5524039 100644
--- a/manifest/ffmpeg
+++ b/manifest/ffmpeg
@@ -9,7 +9,7 @@
     <import remote="https://fuchsia.googlesource.com/build"
             manifest="manifest/build"
             name="build"
-            revision="5d6035d880d1eb4167ef547911de2cbfbc14d00e"/>
+            revision="fa3995da31036dc4020b32230a3a5f80f15cc5b2"/>
     <import remote="https://fuchsia.googlesource.com/zircon"
             manifest="manifest/zircon"
             name="zircon"