fix compiling errors by using GCC/Clang

source/gui/widgets/group.cpp

@@ -165,13 +165,13 @@ namespace nana{
 		return *this;
 	}
 
-	group& group::collocate()
+	group& group::collocate() throw ()
 	{
 		impl_->place_content.collocate();
 		return *this;
 	}
 
-	group& group::div(const char* div_str)
+	group& group::div(const char* div_str) throw ()
 	{
 		if (div_str)
 			impl_->usr_div_str = div_str;

source/gui/widgets/skeletons/text_editor.cpp

@@ -17,6 +17,7 @@
 #include <nana/unicode_bidi.hpp>
 #include <numeric>
 #include <cwctype>
+#include <cstring>
 #include <set>
 #include <algorithm>