gtext-utils: Add source code patch, update TODO

gtextutils/TODO

@@ -1 +1 @@
-Clean up and test
+Change name to libgtextutils

gtextutils/patches/patch-src_gtextutils_text__line__reader.cpp

@@ -0,0 +1,15 @@
+$NetBSD$
+
+# Modern C++ compilers don't implicitly convert istream to bool
+
+--- src/gtextutils/text_line_reader.cpp.orig	2014-01-05 14:09:32.000000000 -0600
++++ src/gtextutils/text_line_reader.cpp	2019-01-07 19:39:57.233565835 -0600
+@@ -44,6 +44,7 @@ bool TextLineReader::next_line()
+ 	if (input_stream.eof())
+ 		return false;
+ 
+-	return input_stream ;
++        // Fix based on the only code change since 0.7
++	return input_stream.good() ;
+ }
+