C++17 is the default now.

Test: builds
Change-Id: I6814455e9ad2cdcf99ad66de38a3ad0bfb440d80

adb/Android.bp

@@ -25,7 +25,6 @@ cc_defaults {
         "-Wvla",
     ],
     rtti: true,
-    cpp_std: "gnu++17",
 
     use_version_lib: true,
 
@@ -72,7 +71,7 @@ cc_defaults {
                 "-DUNICODE=1",
                 "-D_UNICODE=1",
 
-                // -std=gnu++11 doesn't set _GNU_SOURCE on Windows.
+                // Unlike on Linux, -std=gnu++ doesn't set _GNU_SOURCE on Windows.
                 "-D_GNU_SOURCE",
 
                 // MinGW hides some things behind _POSIX_SOURCE.

debuggerd/Android.bp

@@ -9,7 +9,6 @@ cc_defaults {
         "-Wno-nullability-completeness",
         "-Os",
     ],
-    cpp_std: "gnu++17",
 
     local_include_dirs: ["include"],
 }

fastboot/Android.bp

@@ -144,8 +144,6 @@ cc_binary {
     static_libs: [
         "libhealthhalutils",
     ],
-
-    cpp_std: "c++17",
 }
 
 cc_defaults {
@@ -212,7 +210,6 @@ cc_library_host_static {
     name: "libfastboot",
     defaults: ["fastboot_host_defaults"],
 
-    cpp_std: "c++17",
     srcs: [
         "bootimg_utils.cpp",
         "fastboot.cpp",

fs_mgr/Android.bp

@@ -25,9 +25,6 @@ cc_defaults {
         "-Werror",
         "-Wno-unused-variable",
     ],
-    cppflags: [
-        "-std=gnu++1z",
-    ],
 }
 
 cc_library {

init/Android.mk

@@ -35,7 +35,6 @@ init_cflags += \
     -Wall -Wextra \
     -Wno-unused-parameter \
     -Werror \
-    -std=gnu++1z \
 
 # --