gdbsupport: remove attempt to define TARGET_WORD_SIZE

In the gdbsupport configure.ac file, there is an attempt to define
TARGET_WORD_SIZE.  This is done by running grep on the file
../bfd/bfd-in3.h.

The problem with this is, the file bfd-in3.h is generated into the bfd
build directory when bfd is configured, and there is no dependency
between the gdbsupport module and the bfd module, so, for example, if
I do:

  $ ../src/configure
  $ make all-gdbsupport

Then bfd will neither be configured, or built.  In this case
TARGET_WORD_SIZE ends up being defined, but with no value because the
grep on bfd-in3.h fails.

However, it turns out that this doesn't matter; we don't actually use
TARGET_WORD_SIZE anywhere.

My proposal in this commit is to just remove the definition of
TARGET_WORD_SIZE, the alternative would be to add a dependency between
configure-gdbsupport and configure-bfd into Makefile.def, but adding a
dependency for something we don't need seems pretty pointless.

gdbsupport/config.in

@@ -354,9 +354,6 @@
 /* Define to 1 if you have the ANSI C header files. */
 #undef STDC_HEADERS
 
-/* Define to the word size for the target. */
-#undef TARGET_WORD_SIZE
-
 /* Enable extensions on AIX 3, Interix.  */
 #ifndef _ALL_SOURCE
 # undef _ALL_SOURCE

gdbsupport/configure

@@ -10286,13 +10286,6 @@ ac_compiler_gnu=$ac_cv_c_compiler_gnu
 
 
 
-TARGET_WORD_SIZE=`sed -n 's,#define BFD_ARCH_SIZE \(.*\)$,\1,p' ../bfd/bfd-in3.h`
-
-cat >>confdefs.h <<_ACEOF
-#define TARGET_WORD_SIZE $TARGET_WORD_SIZE
-_ACEOF
-
-
 case ${host} in
   *mingw32*)
 

gdbsupport/configure.ac

@@ -59,10 +59,6 @@ GDB_AC_PTRACE
 # Detect support warning flags.
 AM_GDB_WARNINGS
 
-TARGET_WORD_SIZE=`sed -n 's,#define BFD_ARCH_SIZE \(.*\)$,\1,p' ../bfd/bfd-in3.h`
-AC_DEFINE_UNQUOTED(TARGET_WORD_SIZE, $TARGET_WORD_SIZE,
-   [Define to the word size for the target.])
-
 case ${host} in
   *mingw32*)
     AC_DEFINE(USE_WIN32API, 1,