std.cfg: Added support for std::string::reserve().

cfg/std.cfg

@@ -6121,6 +6121,15 @@ The obsolete function 'gets' is called. With 'gets' you'll get a buffer overrun
       <not-uninit/>
     </arg>
   </function>
+  <!-- void reserve (size_t n = 0); -->
+  <function name="std::string::reserve,std::wstring::reserve,std::basic_string::reserve">
+    <noreturn>false</noreturn>
+    <leak-ignore/>
+    <arg nr="1" default="0">
+      <not-uninit/>
+      <valid>0:</valid>
+    </arg>
+  </function>
   <!-- InputIterator std::adjacent_find(InputIterator first, InputIterator last) -->
   <function name="std::adjacent_find">
     <use-retval/>