refactor: c/ -> usr/, compiled program blobs out of the source tree

Userland sources live in usr/ (fits the Unix theme better than 'c').
SDCC output .bin blobs land in build/usr/ with the other build artifacts
instead of littering the source dir; programs.asm INCBINs them from there.
Byte-identical ROM.

1 files changed, 2 insertions, 0 deletions

diff --git a/usr/uname.c b/usr/uname.c
new file mode 100644
index 0000000..511501d
--- /dev/null
+++ b/usr/uname.c
@@ -0,0 +1,2 @@
+#include "gbos.h"
+void main(void) { puts("gbos sm83 (Game Boy Color)"); nl(); }