fix: Add Arduino setup()/loop() functions back

Added setup()/loop() functions back to *_main.cc files to support compiling in CI.  Future features could enable this for the end user.

googlemock/src/gmock_main.cc

@@ -32,6 +32,18 @@
 #include "gmock/gmock.h"
 #include "gtest/gtest.h"
 
+#ifdef ARDUINO
+void setup() {
+  int argc = 0;
+  char** argv = nullptr;
+  // Since Google Mock depends on Google Test, InitGoogleMock() is
+  // also responsible for initializing Google Test.  Therefore there's
+  // no need for calling testing::InitGoogleTest() separately.
+  testing::InitGoogleMock(&argc, argv);
+}
+void loop() { RUN_ALL_TESTS(); }
+#else
+
 // MS C++ compiler/linker has a bug on Windows (not on Windows CE), which
 // causes a link error when _tmain is defined in a static library and UNICODE
 // is enabled. For this reason instead of _tmain, main function is used on
@@ -52,3 +64,5 @@ GTEST_API_ int main(int argc, char** argv) {
   testing::InitGoogleMock(&argc, argv);
   return RUN_ALL_TESTS();
 }
+
+#endif

googletest/src/gtest_main.cc

@@ -30,8 +30,22 @@
 #include <stdio.h>
 #include "gtest/gtest.h"
 
+#ifdef ARDUINO
+void setup() {
+  int argc = 0;
+  char** argv = nullptr;
+  testing::InitGoogleTest(&argc, argv);
+}
+
+void loop() { RUN_ALL_TESTS(); }
+
+#else
+
 GTEST_API_ int main(int argc, char **argv) {
   printf("Running main() from %s\n", __FILE__);
   testing::InitGoogleTest(&argc, argv);
   return RUN_ALL_TESTS();
 }
+
+#endif
+