binding: Use `ASM` mode on the linux + non glibc environ
binding: Use `ASM` mode on the linux + non glibc environ

POSIX no more support `ucontext_t` operation.

Reference:
http://wiki.musl-libc.org/wiki/Open_Issues#ucontext.h

Icenium/node-fibers,laverdet/node-fibers,Icenium/node-fibers,meteor/node-fibers,laverdet/node-fibers,laverdet/node-fibers,Icenium/node-fibers,laverdet/node-fibers,meteor/node-fibers,meteor/node-fibers,meteor/node-fibers,Icenium/node-fibers