Makefiles

[crawfxrd]

• Merge common EC directories
• Add a toolchain file per arch
• Replace wildcard with list of files for C source files

Test

Produces identical binaries for all targets.

e.g.:

git co master
make BOARD=system76/oryp6 VERSION=1
mv build/system76/oryp6/1 build/system76/oryp6/0
git co makefiles
make BOARD=system76/oryp6 VERSION=1
diff -r build/system76/oryp6/0 build/system76/oryp6/1