Introduce ACLOCAL_AMFLAGS macro
Introduce ACLOCAL_AMFLAGS macro

This respects the hint:
libtoolize: Consider adding '-I m4' to ACLOCAL_AMFLAGS in Makefile.am

Signed-off-by: Michael Heimpold <59934addbc17c0fa64a0bf4bb38537fc23439974@heimpold.de>

mhei/libugpio,mhei/libugpio