Revert "Update V8 DEPS."

This *partially* reverts commit b983076b
(only the v8/build roll).

Reason for revert: https://ci.chromium.org/p/v8/builders/ci/V8%20Mac64/35550

Original change's description:
> Update V8 DEPS.
>
> Rolling v8/build: https://chromium.googlesource.com/chromium/src/build/+log/bdbc779..f99e62d
>
> Rolling v8/third_party/aemu-linux-x64: -zGqW99um_GNQKURMgzhK855VvGi_CfraQRvXhNduEQC..BSmiob0gPivtoM5FO4ByhQHofOIKJ7KxRVPyfzhrjTkC
>
> Rolling v8/third_party/catapult: https://chromium.googlesource.com/catapult/+log/b2282fe..342ad52
>
> Rolling v8/third_party/depot_tools: https://chromium.googlesource.com/chromium/tools/depot_tools/+log/cebfb4e..a58287b
>
> TBR=machenbach@chromium.org,tmrts@chromium.org,v8-waterfall-sheriff@grotations.appspotmail.com
>
> Change-Id: I696aa9bbd31a36830f2b13ea51b8a75a03cf717d
> Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2319386
> Reviewed-by: v8-ci-autoroll-builder <v8-ci-autoroll-builder@chops-service-accounts.iam.gserviceaccount.com>
> Commit-Queue: v8-ci-autoroll-builder <v8-ci-autoroll-builder@chops-service-accounts.iam.gserviceaccount.com>
> Cr-Commit-Position: refs/heads/master@{#69058}

TBR=machenbach@chromium.org,v8-ci-autoroll-builder@chops-service-accounts.iam.gserviceaccount.com,tmrts@chromium.org,v8-waterfall-sheriff@grotations.appspotmail.com

Change-Id: I711b8a94ed2ef9c3df6bdcbcda4752881e50aff2
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: chromium:1049569
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2317868Reviewed-by: Clemens Backes <clemensb@chromium.org>
Commit-Queue: Clemens Backes <clemensb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#69059}

DEPS

@@ -80,7 +80,7 @@ vars = {
 
 deps = {
   'v8/build':
-    Var('chromium_url') + '/chromium/src/build.git' + '@' + 'f99e62db9652b7b06e1a30f0aad5d400d7155efc',
+    Var('chromium_url') + '/chromium/src/build.git' + '@' + 'bdbc779ea9e92988756e4992cee8e0c08c4018f6',
   'v8/third_party/depot_tools':
     Var('chromium_url') + '/chromium/tools/depot_tools.git' + '@' + 'a58287b8ee082bbbb0cf13286649f135a9137bdc',
   'v8/third_party/icu':