build: fix bazel build for c++17 (#5097)

This commit changes the way bazel chooses which version to build.
Before, we had a COPT set to -std=c++17, which is analogous to the cmake
way.
However, googletest decided to follow abseil, meaning this is *not*
recommended at all, and causes a mixed-standard build.

From https://github.com/abseil/abseil-cpp/blob/master/FAQ.md#how-to-i-set-the-c-dialect-used-to-build-abseil
we have 3 options to define the standard. Using a bazelrc is what I
believe to be the simplest, as it "fixes" the repo standard.

Signed-off-by: Nathan Gauër <brioche@google.com>

.bazelrc

@@ -0,0 +1 @@
+build --cxxopt=-std=c++17

DEPS

@@ -5,9 +5,7 @@ vars = {
 
   'effcee_revision': 'c7b4db79f340f7a9981e8a484f6d5785e24242d1',
 
-  # Pin to the last version of googletest that supports C++11.
-  # Anything later requires C++14
-  'googletest_revision': 'v1.12.0',
+  'googletest_revision': 'ebedaa18c7cafa15f06ab3d814440e510fad9559',
 
   # Use protobufs before they gained the dependency on abseil
   'protobuf_revision': 'v3.13.0.1',

build_defs.bzl

@@ -4,13 +4,10 @@ COMMON_COPTS = [
     "-DSPIRV_CHECK_CONTEXT",
     "-DSPIRV_COLOR_TERMINAL",
 ] + select({
-    # On Windows, assume MSVC.
-    # C++14 is the default in VisualStudio 2017.
     "@platforms//os:windows": [],
     "//conditions:default": [
         "-DSPIRV_LINUX",
         "-DSPIRV_TIMER_ENABLED",
-        "-std=c++11",
         "-fvisibility=hidden",
         "-fno-exceptions",
         "-fno-rtti",

utils/roll_deps.sh

@@ -31,7 +31,7 @@ function ExitIfIsInterestingError() {
 
 # We are not rolling google test for now. The latest version requires C++14.
 dependencies=("external/effcee/"
-#             "external/googletest/")
+              "external/googletest/"
               "external/re2/"
               "external/spirv-headers/")