avoid C4996 warning on MSVC for utilities

[jmckenna]

• using master with MSVC 2022 gives the following warnings:

[ 71%] Building C object bin/CMakeFiles/listgeo.dir/listgeo.c.obj
listgeo.c
\libgeotiff\bin\listgeo.c(280): warning C4996: 'strcpy': This function or variable may be unsafe. Consider using strcpy_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.
\libgeotiff\bin\listgeo.c(286): warning C4996: 'strcat': This function or variable may be unsafe. Consider using strcat_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.
\libgeotiff\bin\listgeo.c(274): warning C4996: 'strncpy': This function or variable may be unsafe. Consider using strncpy_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.
[ 75%] Building C object bin/CMakeFiles/listgeo.dir/getopt.c.obj
getopt.c
[ 78%] Linking C executable listgeo.exe
[ 78%] Built target listgeo
[ 82%] Building C object bin/CMakeFiles/applygeo.dir/applygeo.c.obj
applygeo.c
[ 85%] Building C object bin/CMakeFiles/applygeo.dir/getopt.c.obj
getopt.c
[ 89%] Linking C executable applygeo.exe
[ 89%] Built target applygeo
[ 92%] Building C object bin/CMakeFiles/geotifcp.dir/geotifcp.c.obj
geotifcp.c
\libgeotiff\bin\geotifcp.c(252): warning C4996: 'fscanf': This function or variable may be unsafe. Consider using fscanf_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.
\libgeotiff\bin\geotifcp.c(253): warning C4996: 'fscanf': This function or variable may be unsafe. Consider using fscanf_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.
\libgeotiff\bin\geotifcp.c(254): warning C4996: 'fscanf': This function or variable may be unsafe. Consider using fscanf_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.
\libgeotiff\bin\geotifcp.c(255): warning C4996: 'fscanf': This function or variable may be unsafe. Consider using fscanf_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.
\libgeotiff\bin\geotifcp.c(256): warning C4996: 'fscanf': This function or variable may be unsafe. Consider using fscanf_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.
\libgeotiff\bin\geotifcp.c(257): warning C4996: 'fscanf': This function or variable may be unsafe. Consider using fscanf_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.
\libgeotiff\bin\geotifcp.c(317): warning C4996: 'fopen': This function or variable may be unsafe. Consider using fopen_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.
\libgeotiff\bin\geotifcp.c(484): warning C4996: 'setbuf': This function or variable may be unsafe. Consider using setvbuf instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.
[ 96%] Building C object bin/CMakeFiles/geotifcp.dir/getopt.c.obj
getopt.c
[100%] Linking C executable geotifcp.exe
[100%] Built target geotifcp

• this PR sets -D_CRT_SECURE_NO_WARNINGS in the /bin CMakeLists.txt (which is already set in the root CMakeLists.txt)