Googletest export

Bump `cmake_minimum_required` to 3.5.

Delete conditional branches exclusive to older versions.

Notable dependents:
  - github.com/grpc/grpc >= 3.5.1
  - github.com/abseil/abseil-cpp >= 3.5
  - github.com/googleapis/google-cloud-cpp >= 3.5

On the other hand, github.com/protocolbuffers/protobuf is >= 3.1.3, but it only depends on GoogleTest 1.10.

Fixes #3523

PiperOrigin-RevId: 392073834
diff --git a/CMakeLists.txt b/CMakeLists.txt
index ea81ab1..7d2eb81 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1,7 +1,7 @@
 # Note: CMake support is community-based. The maintainers do not use CMake
 # internally.
 
-cmake_minimum_required(VERSION 2.8.12)
+cmake_minimum_required(VERSION 3.5)
 
 if (POLICY CMP0048)
   cmake_policy(SET CMP0048 NEW)
@@ -10,10 +10,8 @@
 project(googletest-distribution)
 set(GOOGLETEST_VERSION 1.11.0)
 
-if (CMAKE_VERSION VERSION_GREATER "3.0.2")
-  if(NOT CYGWIN AND NOT MSYS AND NOT ${CMAKE_SYSTEM_NAME} STREQUAL QNX)
-    set(CMAKE_CXX_EXTENSIONS OFF)
-  endif()
+if(NOT CYGWIN AND NOT MSYS AND NOT ${CMAKE_SYSTEM_NAME} STREQUAL QNX)
+  set(CMAKE_CXX_EXTENSIONS OFF)
 endif()
 
 enable_testing()
diff --git a/googlemock/CMakeLists.txt b/googlemock/CMakeLists.txt
index e7df8ec..2b55ba1 100644
--- a/googlemock/CMakeLists.txt
+++ b/googlemock/CMakeLists.txt
@@ -36,13 +36,9 @@
 # as ${gmock_SOURCE_DIR} and to the root binary directory as
 # ${gmock_BINARY_DIR}.
 # Language "C" is required for find_package(Threads).
-if (CMAKE_VERSION VERSION_LESS 3.0)
-  project(gmock CXX C)
-else()
-  cmake_policy(SET CMP0048 NEW)
-  project(gmock VERSION ${GOOGLETEST_VERSION} LANGUAGES CXX C)
-endif()
-cmake_minimum_required(VERSION 2.8.12)
+cmake_minimum_required(VERSION 3.5)
+cmake_policy(SET CMP0048 NEW)
+project(gmock VERSION ${GOOGLETEST_VERSION} LANGUAGES CXX C)
 
 if (COMMAND set_up_hermetic_build)
   set_up_hermetic_build()
diff --git a/googletest/CMakeLists.txt b/googletest/CMakeLists.txt
index abdd98b..15b8f0c 100644
--- a/googletest/CMakeLists.txt
+++ b/googletest/CMakeLists.txt
@@ -46,14 +46,9 @@
 
 # Project version:
 
-if (CMAKE_VERSION VERSION_LESS 3.0)
-  project(gtest CXX C)
-  set(PROJECT_VERSION ${GOOGLETEST_VERSION})
-else()
-  cmake_policy(SET CMP0048 NEW)
-  project(gtest VERSION ${GOOGLETEST_VERSION} LANGUAGES CXX C)
-endif()
-cmake_minimum_required(VERSION 2.8.12)
+cmake_minimum_required(VERSION 3.5)
+cmake_policy(SET CMP0048 NEW)
+project(gtest VERSION ${GOOGLETEST_VERSION} LANGUAGES CXX C)
 
 if (POLICY CMP0063) # Visibility
   cmake_policy(SET CMP0063 NEW)