BUILD: update the list of supported targets and compilers in makefile and readme

The list of suggested targets reported in the default make command was not
up to date. The equivalent versions were updated in the README as well as
the supported compiler versions.
diff --git a/Makefile b/Makefile
index 422a853..4703c2c 100644
--- a/Makefile
+++ b/Makefile
@@ -890,8 +890,9 @@
 	@echo
 	@echo "Please choose the target among the following supported list :"
 	@echo
-	@echo "   linux2628, linux26, linux24, linux24e, linux22, solaris"
-	@echo "   freebsd, openbsd, cygwin, custom, generic"
+	@echo "   linux2628, linux26, linux24, linux24e, linux22, solaris,"
+	@echo "   freebsd, netbsd, osx, openbsd, aix51, aix52, cygwin, haiku,"
+	@echo "   generic, custom"
 	@echo
 	@echo "Use \"generic\" if you don't want any optimization, \"custom\" if you"
 	@echo "want to precisely tweak every option, or choose the target which"