build: Treat warnings as errors (#923)

* squash and rebase andronov-alexey:treat_warnings_as_errors from pull request #850
* fix remaining warnings in java lib

src/lib_java/utility/utilityJava.cpp

@@ -188,7 +188,10 @@ std::vector<FilePath> getClassPath(
 
 void setJavaHomeVariableIfNotExists()
 {
+#pragma warning(push)
+#pragma warning(disable : 4996)
 	if (getenv("JAVA_HOME") == nullptr)
+#pragma warning(pop)
 	{
 		const FilePath javaPath = ApplicationSettings::getInstance()->getJavaPath();
 		const FilePath javaHomePath =
@@ -197,8 +200,10 @@ void setJavaHomeVariableIfNotExists()
 		LOG_WARNING(
 			"Environment variable \"JAVA_HOME\" not found on system. Setting value to \"" +
 			javaHomePath.str() + "\" for this process.");
-
+#pragma warning(push)
+#pragma warning(disable : 4996)
 		putenv(const_cast<char*>(("JAVA_HOME=" + javaHomePath.str()).c_str()));
+#pragma warning(pop)
 	}
 }
 }	 // namespace utility