sim: igen: do not reindent literal semantics output

When generating semantics.c from .igen source files, indenting the code
makes it more readable, but confuses compiler diagnostics.  The latter
is a bit more important than the former, so bias towards that.

For example, with an introduced error, we can see w/gcc-13:

(before this change)
  CC       mn10300/semantics.o
../../../sim/mn10300/am33-2.igen: In function ‘semantic_dcpf_D1a’:
../../../sim/mn10300/am33-2.igen:11:5: error: ‘srcreg’ undeclared (first use in this function)
   11 |   srcreg = translate_rreg (SD_, RN2);
      |     ^~~~~~

(with this change)
  CC       mn10300/semantics.o
../../../sim/mn10300/am33-2.igen: In function ‘semantic_dcpf_D1a’:
../../../sim/mn10300/am33-2.igen:11:3: error: ‘srcreg’ undeclared (first use in this function)
   11 |   srcreg = translate_rreg (SD_, RN2);
      |   ^~~~~~

0 files changed, 0 insertions, 0 deletions