[util] Added missing files

src/util/util_env.cpp

@@ -0,0 +1,22 @@
+#include "util_env.h"
+
+#include "./com/com_include.h"
+
+namespace dxvk::env {
+
+  std::string getEnvVar(const wchar_t* name) {
+    DWORD len = ::GetEnvironmentVariableW(name, nullptr, 0);
+    
+    std::wstring result;
+    
+    while (len > result.size()) {
+      result.resize(len);
+      len = ::GetEnvironmentVariableW(
+        name, result.data(), result.size());
+    }
+    
+    result.resize(len);
+    return str::fromws(result);
+  }
+  
+}

src/util/util_env.h

@@ -0,0 +1,18 @@
+#pragma once
+
+#include "util_string.h"
+
+namespace dxvk::env {
+  
+  /**
+   * \brief Gets environment variable
+   * 
+   * If the variable is not defined, this will return
+   * an empty string. Note that environment variables
+   * may be defined with an empty value.
+   * \param [in] name Name of the variable
+   * \returns Value of the variable
+   */
+  std::string getEnvVar(const wchar_t* name);
+  
+}