[committed] libstdc++: Fix unused variable warning

[Jonathan Wakely]

libstdc++-v3/ChangeLog:

	* testsuite/util/testsuite_performance.h (report_header): Remove
	unused variable.

Tested powerpc64le-linux. Committed to trunk.

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commit afcbeb35e0b9fb0251d04362a1bd4031520ff7f8
Author: Jonathan Wakely <jwakely@redhat.com>
Date:   Fri Oct 9 11:52:56 2020

    libstdc++: Fix unused variable warning
    
    libstdc++-v3/ChangeLog:
    
            * testsuite/util/testsuite_performance.h (report_header): Remove
            unused variable.

diff --git a/libstdc++-v3/testsuite/util/testsuite_performance.h b/libstdc++-v3/testsuite/util/testsuite_performance.h
index 8927a4129da..9b69f5f51f7 100644
--- a/libstdc++-v3/testsuite/util/testsuite_performance.h
+++ b/libstdc++-v3/testsuite/util/testsuite_performance.h
@@ -249,7 +249,6 @@ namespace __gnu_test
   void
   report_header(const std::string file, const std::string header)
   {
-    const char space = ' ';
     const char tab = '\t';
     const char* name = "libstdc++-performance.sum";
     std::string::const_iterator i = file.begin() + file.find_last_of('/') + 1;