Suppress std::string DLL interface warning introduced in commit f063cd25c9

Fixes #4171

PiperOrigin-RevId: 514777144
Change-Id: I6f4b309c407684522fc1bc94dcc980ea1fe09cd9

googletest/include/gtest/internal/gtest-port.h

@@ -960,6 +960,8 @@ class GTEST_API_ RE {
 };
 
 #elif defined(GTEST_USES_POSIX_RE) || defined(GTEST_USES_SIMPLE_RE)
+GTEST_DISABLE_MSC_WARNINGS_PUSH_(4251 \
+/* class A needs to have dll-interface to be used by clients of class B */)
 
 // A simple C++ wrapper for <regex.h>.  It uses the POSIX Extended
 // Regular Expression syntax.
@@ -1008,7 +1010,7 @@ class GTEST_API_ RE {
 
 #endif
 };
-
+GTEST_DISABLE_MSC_WARNINGS_POP_()  // 4251
 #endif  // ::testing::internal::RE implementation
 
 // Formats a source file path and a line number as they would appear