[committed] libstdc++: Restore <unistd.h> in testsuite_fs.h header [PR 99096]

[Jonathan Wakely]

libstdc++-v3/ChangeLog:

	PR libstdc++/99096
	* testsuite/util/testsuite_fs.h: Always include <unistd.h>.

Tested x86_64-linux. Committed to trunk.

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commit 4e3590d06cf8a06fcc460ccda6150483a0311bae
Author: Jonathan Wakely <jwakely@redhat.com>
Date:   Sun Feb 14 20:38:32 2021

    libstdc++: Restore <unistd.h> in testsuite_fs.h header [PR 99096]
    
    libstdc++-v3/ChangeLog:
    
            PR libstdc++/99096
            * testsuite/util/testsuite_fs.h: Always include <unistd.h>.

diff --git a/libstdc++-v3/testsuite/util/testsuite_fs.h b/libstdc++-v3/testsuite/util/testsuite_fs.h
index e4d04dd7799..1eadf7fa767 100644
--- a/libstdc++-v3/testsuite/util/testsuite_fs.h
+++ b/libstdc++-v3/testsuite/util/testsuite_fs.h
@@ -34,10 +34,10 @@ namespace test_fs = std::experimental::filesystem;
 #include <fstream>
 #include <string>
 #include <cstdio>
+#include <unistd.h> // unlink, close, getpid
 
 #if defined(_GNU_SOURCE) || _XOPEN_SOURCE >= 500 || _POSIX_C_SOURCE >= 200112L
 #include <stdlib.h> // mkstemp
-#include <unistd.h> // unlink, close
 #else
 #include <random>   // std::random_device
 #endif