changed lib names, minor gcc3.3 warning patches

[SVN r18443]

example/snippets/partial_regex_grep.cpp

@@ -78,7 +78,7 @@ int main(int argc, char* argv[])
 {
    if(argc > 1)
    {
-      for(unsigned int i = 1; i < argc; ++i)
+      for(int i = 1; i < argc; ++i)
       {
          std::ifstream fs(argv[i]);
          if(fs.bad()) continue;

example/snippets/regex_grep_example_3.cpp

@@ -67,9 +67,7 @@ public:
    map_type& get_map() { return index; }
    void IndexClasses(const std::string& file);
    class_index()
-      : index(),
-        expression(re)
-        {}
+      : expression(re) {}
 };
 
 bool class_index::grep_callback(boost::match_results<std::string::const_iterator> what)