NaCl: Update revision in DEPS, efe1c64 -> 87d5dd9

This pulls in the following Native Client changes:

0b3aba1: (jvoung@chromium.org) Add configure/CMake flags for conditionally building subzero targets.
d68a86e: (dschuff@chromium.org) Update revision for PNaCl
353db96: (mcgrathr@chromium.org) Implement a standard ELF loader in untrusted code, to be used by glibc
a5ef853: (jvoung@chromium.org) PNaCl: Update Subzero revision in pnacl/COMPONENT_REVISIONS
16212bd: (tfarina@chromium.org) Cleanup: Remove is_android_webview_build flag from NaCL gn config.
3a6e2fa: (dschuff@chromium.org) PNaCl: Update LLVM revision in pnacl/COMPONENT_REVISIONS
25152f5: (dschuff@chromium.org) Remove 2 torture test known failures for nacl-clang
dcd22d4: (mcgrathr@chromium.org) toolchain_build: Build glibc-flavored gcc_libs and sdk_libs
87d5dd9: (mcgrathr@chromium.org) toolchain_build: Include glibc-flavored gcc_libs in package-version upload

Changes: https://chromium.googlesource.com/native_client/src/native_client/+log/efe1c643770e76a1c4747e4c5bf9338e5a0ef945..87d5dd90911a0657c27574f78e86b7dfc4ad8b29

BUG=none
TEST=browser_tests and nacl_integration
CQ_EXTRA_TRYBOTS=tryserver.chromium.linux:linux_chromium_dbg_32_ng,linux_arm_compile,linux_nacl_sdk_build

Review URL: https://codereview.chromium.org/1106023002

Cr-Commit-Position: refs/heads/master@{#326902}

DEPS

@@ -94,7 +94,7 @@ vars = {
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling NaCl
   # and whatever else without interference from each other.
-  'nacl_revision': 'efe1c643770e76a1c4747e4c5bf9338e5a0ef945',
+  'nacl_revision': '87d5dd90911a0657c27574f78e86b7dfc4ad8b29',
 }
 
 # Only these hosts are allowed for dependencies in this DEPS file.