FIXES
- cmake : force LTO as default
- cmake : use
sh-elf-vhex-gcc-ar
instead ofsh-elf-vhex-ar
to force support LTO - cmake : force SH4A-NOFPU for both ASM and C
- cmake : centralise DSL flags for both ASM and C to avoid warnings with LTO
sh-elf-vhex-gcc-ar
instead of sh-elf-vhex-ar
to force support LTO