arm: Use proper PLT/GOT for -run.

Same as with x86_64, disable the runtime_plt_and_got hack
for -run on arm as well.  For that we need to handle several
relocations as (potentially) generating PLT slots as well.
Tested with mpfr-3.1.2 and gawk (both using --disable-shared),
there are two resp. five pre-existing problems, so no regressions.

This also works toward enabling real shared libs for arm,
but it's not there yet.

tcc.h

@@ -712,7 +712,7 @@ struct TCCState {
     void *write_mem;
     unsigned long mem_size;
 # endif
-# if !defined TCC_TARGET_PE && (defined TCC_TARGET_ARM)
+# if !defined TCC_TARGET_PE && (0)
     /* write PLT and GOT here */
     char *runtime_plt_and_got;
     unsigned runtime_plt_and_got_offset;