Allow -o with multiple files

programs/fileio.h

@@ -84,14 +84,14 @@ int FIO_listMultipleFiles(unsigned numFiles, const char** filenameTable, int dis
 /** FIO_compressMultipleFilenames() :
     @return : nb of missing files */
 int FIO_compressMultipleFilenames(const char** srcNamesTable, unsigned nbFiles,
-                                  const char* suffix,
+                                  const char* outFileName, const char* suffix,
                                   const char* dictFileName, int compressionLevel,
                                   ZSTD_compressionParameters* comprParams);
 
 /** FIO_decompressMultipleFilenames() :
     @return : nb of missing or skipped files */
 int FIO_decompressMultipleFilenames(const char** srcNamesTable, unsigned nbFiles,
-                                    const char* suffix,
+                                    const char* outFileName,
                                     const char* dictFileName);