[tests] avoid architecture-dependent diffs in test oracles

tests/misc/pragma-pack.c

 /*run.config
   STDOPT: #"-machdep gcc_x86_64 -kernel-msg-key typing:pragma"
-  STDOPT: #"-cpp-command=\"gcc -E -C -I. -m32\" -cpp-frama-c-compliant"
+  STDOPT: #"-machdep gcc_x86_32"
   STDOPT: #"-machdep msvc_x86_64"
  */
 

tests/syntax/cpp-command.c

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

tests/syntax/oracle/cpp-command.0.res.oracle

 [kernel] Parsing tests/syntax/cpp-command.c (with preprocessing)
-[cpp-command.c cpp-command.c cpp-command.c cpp-command.c] [TMPDIR/FILE.i TMPDIR/FILE.i TMPDIR/FILE.i TMPDIR/FILE.i] [ -I./share/libc -D__FRAMAC__ -D__FC_MACHDEP_X86_32 -dD -nostdinc -m32]
+[cpp-command.c cpp-command.c cpp-command.c cpp-command.c] [TMPDIR/FILE.i TMPDIR/FILE.i TMPDIR/FILE.i TMPDIR/FILE.i] [ -I./share/libc -D__FRAMAC__ -D__FC_MACHDEP_X86_32 -dD -nostdinc]

tests/syntax/oracle/cpp-command.1.res.oracle

 [kernel] Parsing tests/syntax/cpp-command.c (with preprocessing)
-%1 = cpp-command.c %2 = TMPDIR/FILE.i %args =  -I./share/libc -D__FRAMAC__ -D__FC_MACHDEP_X86_32 -dD -nostdinc -m32
+%1 = cpp-command.c %2 = TMPDIR/FILE.i %args =  -I./share/libc -D__FRAMAC__ -D__FC_MACHDEP_X86_32 -dD -nostdinc

tests/syntax/oracle/cpp-command.4.res.oracle

 [kernel] Preprocessing command:
-  gcc -E -C -I.  -I./share/libc -D__FRAMAC__ -D__FC_MACHDEP_X86_32 -dD -nostdinc -m32 'tests/syntax/cpp-command.c' -o 'TMPDIR/FILE.i'
+  gcc -E -C -I.  -I./share/libc -D__FRAMAC__ -D__FC_MACHDEP_X86_32 -dD -nostdinc 'tests/syntax/cpp-command.c' -o 'TMPDIR/FILE.i'