el_runtime.c was deleted prematurely — elb still resolves the runtime at build time
via a hardcoded relative path, and the elc code generator still emits
#include "el_runtime.h" in generated C.
Restoring el_runtime.c + el_runtime.h as the working build runtime until the
compiler is updated to emit #include "el_seed.h" and link against el_seed.c
directly.
el_seed.h: remove #include "el_runtime.h" that broke after el_runtime.h deletion;
add inline el_val_t typedef + macros + float cast helpers so el_seed.h is fully
self-contained.
Will Anderson
6ede9e4379