std-gnu11: new module

This makes it easier for applications to prefer C11 and C++11
to older variants, when compiling C and C++ code.
Unlike most m4/*.m4 files, m4/std-gnu11.m4 is GPLed, as it copies
a nontrivial chunk of GPLed Autoconf source code.
* COPYING: Mention the m4/*.m4 copyright situation.
* MODULES.html.sh (std-gnu11): New module.
* m4/std-gnu11.m4, modules/std-gnu11: New files.

Author: eggert

COPYING

@@ -14,4 +14,5 @@ were not licensed under LGPL.
 
 Some of the source files in lib/ have different licenses.  Also, the
 copy of maintain.texi in doc/ has a verbatim-copying license, and
-doc/standards.texi and make-stds.texi are GFDL.
+doc/standards.texi and make-stds.texi are GFDL.  Most (but not all)
+m4/*.m4 files have nearly unlimited licenses.

ChangeLog

@@ -1,3 +1,14 @@
+2016-02-02  Paul Eggert  <[email protected]>
+
+	std-gnu11: new module
+	This makes it easier for applications to prefer C11 and C++11
+	to older variants, when compiling C and C++ code.
+	Unlike most m4/*.m4 files, m4/std-gnu11.m4 is GPLed, as it copies
+	a nontrivial chunk of GPLed Autoconf source code.
+	* COPYING: Mention the m4/*.m4 copyright situation.
+	* MODULES.html.sh (std-gnu11): New module.
+	* m4/std-gnu11.m4, modules/std-gnu11: New files.
+
 2016-01-25  Paul Eggert  <[email protected]>
 
 	get-permissions, strftime: fix grammar in comments

MODULES.html.sh

@@ -2338,7 +2338,7 @@ func_all_modules ()
   func_module mbfile
   func_end_table
 
-  element="Support for systems lacking ISO C11"
+  element="Support for systems lacking ISO C 11"
   func_section_wrap c11_sup
   func_wrap H2
   func_echo "$element"
@@ -2350,6 +2350,7 @@ func_all_modules ()
   func_echo "$element"
 
   func_begin_table
+  func_module std-gnu11
   func_module stdalign
   func_end_table