NaCl: Update revision in DEPS, r11279 -> r11294

NaCl: Update revision in DEPS, r11279 -> r11294

This pulls in the following Native Client changes:

r11280: (kschimpf) Update PNaCl LLVM DEPS.
r11281: (mcgrathr) Don't copy various sys/ and bits/ headers into glibc toolchain
r11282: (khim) Enable build ID by default
r11283: (khim) Rollback --enable-linker-build-id change
r11284: (jvoung) Punch the --pnacl-allow-exceptions through from pnacl-driver/ld to translate.
r11285: (dschuff) Remove more cruft for pnacl ARM IRT build.
r11286: (jvoung) Remove hg-migrate code from when we moved the location of pnacl hg checkouts.
r11287: (jvoung) Remove old pnacl/unsupported/non_bitcode_symbols.txt list.
r11288: (mcgrathr) toolchain_build: Enable build-id, update gcc revision
r11289: (khim) Pull binutils changes to make it compatible with --build-id
r11290: (bradnelson) Retain the unstripped nexe at a predictable location.
r11291: (mseaborn) Exception handling: Fix leak of NaClAppThread address (r9) to untrusted code
r11292: (dschuff) Remove native pnacl arm nexe gyp target.
r11293: (jvoung) Update PNaCl in TOOLS_REVISION from 11261 -> 11284
r11294: (khim) Make RodataSwitch compatible with build id.

BUG=none
TEST=nacl_integration