Add common Toolchain.defs for AVR/AVR32; Add Toolchain.defs for ARM; Add more...

Add common Toolchain.defs for AVR/AVR32; Add Toolchain.defs for ARM; Add more toolchain options (from Mike); incdir.sh and .bat now take -s option

git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@5384 42af7a65-404d-4744-a932-0658087f49c3