sim: rename tconfig.in to tconfig.h

Rather than manually include tconfig.h when we think we'll need it (which
is error prone as it can define symbols we expect from config.h), have it
be included directly by config.h.  Since we know we have to include that
header everywhere already, this will make sure tconfig.h isn't missed.

It should also be fine as tconfig.h is supposed to be simple and only set
up a few core defines for the target.

This allows us to stop symlinking it in place all the time and just use
it straight out of the respective source directory.

sim/mips/configure

@@ -8318,6 +8318,8 @@ else
 fi
 
 
+
+
 # Some of the common include files depend on bfd.h, and bfd.h checks
 # that config.h is included first by testing that the PACKAGE macro
 # is defined.
@@ -12400,7 +12402,7 @@ else
   lt_dlunknown=0; lt_dlno_uscore=1; lt_dlneed_uscore=2
   lt_status=$lt_dlunknown
   cat > conftest.$ac_ext <<_LT_EOF
-#line 12403 "configure"
+#line 12405 "configure"
 #include "confdefs.h"
 
 #if HAVE_DLFCN_H
@@ -12506,7 +12508,7 @@ else
   lt_dlunknown=0; lt_dlno_uscore=1; lt_dlneed_uscore=2
   lt_status=$lt_dlunknown
   cat > conftest.$ac_ext <<_LT_EOF
-#line 12509 "configure"
+#line 12511 "configure"
 #include "confdefs.h"
 
 #if HAVE_DLFCN_H
@@ -12987,14 +12989,6 @@ _ACEOF
 sim_link_files=
 sim_link_links=
 
-sim_link_links=tconfig.h
-if test -f ${srcdir}/tconfig.in
-then
-  sim_link_files=tconfig.in
-else
-  sim_link_files=../common/tconfig.in
-fi
-
 # targ-vals.def points to the libc macro description file.
 case "${target}" in
 *-*-*) TARG_VALS_DEF=../common/nltvals.def ;;