Fix compilation issue when libuargp is compiled without __UCLIBC_HAS_PROGRAM_INVOCATION_NAME__
Fix compilation issue when libuargp is compiled without __UCLIBC_HAS_PROGRAM_INVOCATION_NAME__

This fixes the issue reported at https://github.com/wbx-github/uclibc-ng/issues/2

Signed-off-by: Yann Sionneau <107e51edae3af49524ebeba2336408dad277cd21@sionneau.net>

kraj/uclibc-ng,wbx-github/uclibc-ng,wbx-github/uclibc-ng,kraj/uclibc-ng,kraj/uclibc-ng,kraj/uclibc-ng,wbx-github/uclibc-ng,wbx-github/uclibc-ng