replaced AC_PROG_CXX by AC_PROG_CC in configure.ac - we do not use c++
replaced AC_PROG_CXX by AC_PROG_CC in configure.ac - we do not use c++

dkg/libpsl,rockdaboot/libpsl,dago/libpsl,rockdaboot/libpsl,darnir/libpsl,dago/libpsl,darnir/libpsl,dkg/libpsl,dago/libpsl,rockdaboot/libpsl,darnir/libpsl