use internal/libc, updates #177

Makefile

all_test.go

bind_blob.go

bind_blob_musl.go

fcntl.go

go.mod

go.sum

internal/libc/aliases.go

internal/libc/atomic.go

internal/libc/builtin.go

internal/libc/capi_darwin_amd64.go

internal/libc/capi_darwin_arm64.go

internal/libc/capi_freebsd_386.go

internal/libc/capi_freebsd_amd64.go

internal/libc/capi_freebsd_arm.go

internal/libc/capi_freebsd_arm64.go

internal/libc/capi_illumos_amd64.go

internal/libc/capi_linux_386.go

internal/libc/capi_linux_amd64.go

internal/libc/capi_linux_arm.go