bootstrap: Drop unnecessary KWSys platform check

The KWSys Configure.hxx header no longer needs KWSYS_STAT_HAS_ST_MTIM.
Our bootstrap-built CMake does not need to handle nanosecond precision
file times anyway.

bootstrap

@@ -493,7 +493,7 @@ cmake_kwsys_config_replace_string ()
                 s/@KWSYS_LFS_REQUESTED@/${KWSYS_LFS_REQUESTED}/g;
                 s/@KWSYS_NAME_IS_KWSYS@/${KWSYS_NAME_IS_KWSYS}/g;
                 s/@KWSYS_STL_HAS_WSTRING@/${KWSYS_STL_HAS_WSTRING}/g;
-                s/@KWSYS_STAT_HAS_ST_MTIM@/${KWSYS_STAT_HAS_ST_MTIM}/g;}" >> "${OUTFILE}${_tmp}"
+               }" >> "${OUTFILE}${_tmp}"
     if [ -f "${OUTFILE}${_tmp}" ]; then
       if "${_diff}" "${OUTFILE}" "${OUTFILE}${_tmp}" > /dev/null 2> /dev/null ; then
         #echo "Files are the same"
@@ -1173,7 +1173,6 @@ KWSYS_NAME_IS_KWSYS=0
 KWSYS_BUILD_SHARED=0
 KWSYS_LFS_AVAILABLE=0
 KWSYS_LFS_REQUESTED=0
-KWSYS_STAT_HAS_ST_MTIM=0
 KWSYS_STL_HAS_WSTRING=0
 KWSYS_CXX_HAS_SETENV=0
 KWSYS_CXX_HAS_UNSETENV=0
@@ -1217,15 +1216,6 @@ else
   echo "${cmake_cxx_compiler} does not have stl wstring"
 fi
 
-if cmake_try_run "${cmake_cxx_compiler}" \
-  "${cmake_cxx_flags} -DTEST_KWSYS_STAT_HAS_ST_MTIM" \
-  "${cmake_source_dir}/Source/kwsys/kwsysPlatformTestsCXX.cxx" >> cmake_bootstrap.log 2>&1; then
-  KWSYS_STAT_HAS_ST_MTIM=1
-  echo "${cmake_cxx_compiler} has struct stat with st_mtim member"
-else
-  echo "${cmake_cxx_compiler} does not have struct stat with st_mtim member"
-fi
-
 # Just to be safe, let us store compiler and flags to the header file
 
 cmake_bootstrap_version='$Revision$'