Update m4 scripts, fix Clang compilation warnings
Update m4 scripts, fix Clang compilation warnings

realincubus/openscop,ftynse/openscop,Haerezis/openscop,periscop/openscop,Haerezis/openscop,Haerezis/openscop,BobSaget-Mod/osl-saber,realincubus/openscop,UBERTC/osl,realincubus/openscop,periscop/openscop,periscop/openscop,UBERTC/osl,ftynse/openscop,ftynse/openscop,BobSaget-Mod/osl-saber,UBERTC/osl,BobSaget-Mod/osl-saber