avoid test differences in some ARM64 configurations

tests/syntax/cpp-command.c

 /* run.config*
-   FILTER: sed "s:/[^ ]*[/]cpp-command\.[^ ]*\.i:TMPDIR/FILE.i:g; s:$PWD/::g; s:$(realpath @FRAMAC_SHARE@)/:FRAMAC_SHARE/:g; s:@PTEST_MAKE_DIR@/result@PTEST_CONFIG@/::g; s: -m32::"
+   FILTER: sed "s:/[^ ]*[/]cpp-command\.[^ ]*\.i:TMPDIR/FILE.i:g; s:$PWD/::g; s:$(realpath @FRAMAC_SHARE@)/:FRAMAC_SHARE/:g; s:@PTEST_MAKE_DIR@/result@PTEST_CONFIG@/::g; s: -m32::; s: -m64::"
    OPT: -machdep x86_32 -cpp-frama-c-compliant -cpp-command "echo [\$(basename '%1') \$(basename '%1') \$(basename '%i') \$(basename '%input')] ['%2' '%2' '%o' '%output'] ['%args']"
    OPT: -machdep x86_32 -cpp-frama-c-compliant -cpp-command "echo %%1 = \$(basename '%1') %%2 = '%2' %%args = '%args'"
    OPT: -machdep x86_32 -cpp-frama-c-compliant -cpp-command "printf \"%s\n\" \"using \\% has no effect : \$(basename \"\%input\")\""

tests/syntax/oracle/cpp-command.6.res.oracle

 [kernel] Warning: your preprocessor is not known to handle option `-nostdinc'. If pre-processing fails because of it, please add -no-cpp-frama-c-compliant option to Frama-C's command-line. If you do not want to see this warning again, explicitly use option -cpp-frama-c-compliant.
 [kernel] Warning: your preprocessor is not known to handle option `-dD'. If pre-processing fails because of it, please add -no-cpp-frama-c-compliant option to Frama-C's command-line. If you do not want to see this warning again, explicitly use option -cpp-frama-c-compliant.
 [kernel] Parsing cpp-command.c (with preprocessing)
-extra_args: -IFRAMAC_SHARE/libc -D__FRAMAC__ -D__FC_MACHDEP_X86_64 -dD -nostdinc -m64 file_extra global_extra
+extra_args: -IFRAMAC_SHARE/libc -D__FRAMAC__ -D__FC_MACHDEP_X86_64 -dD -nostdinc file_extra global_extra
 [kernel] Warning: trying to preprocess annotation with an unknown preprocessor.
 /* Generated by Frama-C */