Adds support to macro expansion in setvar action

src/utils.cc

@@ -112,6 +112,16 @@ std::string tolower(std::string str) {
     return value;
 }
 
+std::string toupper(std::string str) {
+    std::locale loc;
+    std::string value;
+
+    for (std::string::size_type i=0; i < str.length(); ++i) {
+        value.assign(value + std::toupper(str[i], loc));
+    }
+
+    return value;
+}
 
 const char SAFE[256] = {
     /*      0 1 2 3  4 5 6 7  8 9 A B  C D E F */