dksh4: Build binutils and gcc
.gitignore: Ignore .devkitSH4
dksh4: Get newlib to build
dksh4: Add some basic rules
dksh4: Build general tools
dksh4: Add dreamcast memory map and linker script
dksh4: Add a crt for dreamcast
separate base tools, Snow Leopard fix & MSVC error filter from build rules
add changes for cross compiling 64bit windows toolchains
simplify cross building
update gcc & gdb versions