Update discussion about using dependencies in mixed Cygwin/Windowas native environments

Documentation/NuttxPortingGuide.html

@@ -1440,6 +1440,8 @@ tools/
 |-- configure.sh / configure.bat
 |-- cfgparser.c
 |-- cfgparser.h
+|-- cmpconfig.c
+|-- cnvwindeps.c
 |-- copydir.sh / copydir.bat
 |-- define.sh / define.bat
 |-- incdir.sh / indir.bat
@@ -1453,6 +1455,7 @@ tools/
 |-- mkromfsimg.sh
 |-- mksyscall.c
 |-- mkversion.c
+|-- mkwindeps.sh
 |-- unlink.sh / unlink.bat
 |-- version.sh
 `-- zipme.sh