Add some more SetupEnvironment failure/skip demos

These were used in illustrating the issue discussed in:
google/googletest#2189 .

While here, remove a duplicate "#define" for `GTEST_THREADSAFE` and move
setup_environment_fail_demo.cc to
setup_environment_nonfatal_fail_demo.cc, since I now know that I was
testing for non-fatal failures (which don't cause the test to abort).

Contributed (in part) by @asomers.

programming/c++/gtest/Makefile

@@ -2,13 +2,15 @@ PROGS+=	disabled_demo
 PROGS+=	expect_nonfatal_failure_demo
 PROGS+=	fixture_fail_demo
 PROGS+=	pass_fail_demo
-PROGS+=	setup_environment_fail_demo
+PROGS+=	setup_environment_fatal_fail_demo
+PROGS+=	setup_environment_nonfatal_fail_demo
+PROGS+=	setup_environment_skip_demo
 PROGS+=	skip_demo
 PROGS+=	teardown_environment_fail_demo
 
 CXXFLAGS+=	-Werror -W -Wall -Wunused
 CXXFLAGS+=	-std=c++11
-CXXFLAGS+=	-DGTEST_HAS_PTHREAD=1 -DGTEST_IS_THREADSAFE=1
+CXXFLAGS+=	-DGTEST_HAS_PTHREAD=1
 CXXFLAGS+=	-DGTEST_LINKED_AS_SHARED_LIBRARY=1
 
 ifdef GITDIR

programming/c++/gtest/setup_environment_fatal_fail_demo.cc

@@ -0,0 +1,24 @@
+#include <gtest/gtest.h>
+
+class SetupEnvironment : public testing::Environment {
+public:
+  void SetUp() override {
+    GTEST_FAIL() << "Calling a fatal failure";
+  }
+};
+
+TEST(Test, AlwaysPasses) {
+  EXPECT_EQ(true, true);
+}
+
+TEST(Test, AlwaysFails) {
+  EXPECT_EQ(true, false);
+}
+
+int main(int argc, char **argv) {
+  testing::InitGoogleTest(&argc, argv);
+
+  testing::AddGlobalTestEnvironment(new SetupEnvironment());
+
+  return (RUN_ALL_TESTS());
+}

programming/c++/gtest/setup_environment_nonfatal_fail_demo.cc

@@ -0,0 +1,24 @@
+#include <gtest/gtest.h>
+
+class SetupEnvironment : public ::testing::Environment {
+public:
+  void SetUp() override {
+    EXPECT_EQ(false, true);
+  }
+};
+
+TEST(Test, AlwaysPasses) {
+  EXPECT_EQ(true, true);
+}
+
+TEST(Test, AlwaysFails) {
+  EXPECT_EQ(true, false);
+}
+
+int main(int argc, char **argv) {
+  testing::InitGoogleTest(&argc, argv);
+
+  testing::AddGlobalTestEnvironment(new SetupEnvironment());
+
+  return RUN_ALL_TESTS();
+}

programming/c++/gtest/setup_environment_skip_demo.cc

@@ -0,0 +1,24 @@
+#include <gtest/gtest.h>
+
+class SetupEnvironment : public testing::Environment {
+public:
+  void SetUp() override {
+    GTEST_SKIP() << "Skipping the entire environment";
+  }
+};
+
+TEST(Test, AlwaysPasses) {
+  EXPECT_EQ(true, true);
+}
+
+TEST(Test, AlwaysFails) {
+  EXPECT_EQ(true, false);
+}
+
+int main(int argc, char **argv) {
+  testing::InitGoogleTest(&argc, argv);
+
+  testing::AddGlobalTestEnvironment(new SetupEnvironment());
+
+  return (RUN_ALL_TESTS());
+}