string utils: cleanup

Change-Id: I31f6aa38b7773bc0ecbdeb4ba2ae556f3fd53cc3

src/string_utils.cpp

@@ -70,16 +70,6 @@ bstrToStdString(BSTR bstr)
 }
 #endif
 
-std::string
-to_string(double value)
-{
-    char buf[64];
-    int len = snprintf(buf, sizeof(buf), "%-.*G", 16, value);
-    if (len <= 0)
-        throw std::invalid_argument{"can't parse double"};
-    return {buf, (size_t)len};
-}
-
 std::string
 trim(const std::string &s)
 {