[committed] libstdc++: Fix some -Wunused-parameter warnings

[Jonathan Wakely]

libstdc++-v3/ChangeLog:

	* include/bits/codecvt.h (codecvt_byname): Remove names of
	unused parameters.

Tested powerpc64le-linux. Committed to trunk.

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commit 36efcd7de0431b099087d8ae1ad358b0e088a250
Author: Jonathan Wakely <jwakely@redhat.com>
Date:   Thu Sep 10 17:09:16 2020

    libstdc++: Fix some -Wunused-parameter warnings
    
    libstdc++-v3/ChangeLog:
    
            * include/bits/codecvt.h (codecvt_byname): Remove names of
            unused parameters.

diff --git a/libstdc++-v3/include/bits/codecvt.h b/libstdc++-v3/include/bits/codecvt.h
index f6e20f0649c..e6efa166109 100644
--- a/libstdc++-v3/include/bits/codecvt.h
+++ b/libstdc++-v3/include/bits/codecvt.h
@@ -763,7 +763,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
     {
     public:
       explicit
-      codecvt_byname(const char* __s, size_t __refs = 0)
+      codecvt_byname(const char*, size_t __refs = 0)
       : codecvt<char16_t, char8_t, mbstate_t>(__refs) { }
 
       explicit
@@ -781,7 +781,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
     {
     public:
       explicit
-      codecvt_byname(const char* __s, size_t __refs = 0)
+      codecvt_byname(const char*, size_t __refs = 0)
       : codecvt<char32_t, char8_t, mbstate_t>(__refs) { }
 
       explicit