message: build: Drop use_pkgconfig check for libmultiprocess check
diff: @@ -1375,12 +1375,10 @@ dnl libmultiprocess library check
  libmultiprocess_found=no
  if test "x$with_libmultiprocess" = xyes || test "x$with_libmultiprocess" = xauto; then
  - if test "x$use_pkgconfig" = xyes; then
  m4_ifdef([PKG_CHECK_MODULES], [PKG_CHECK_MODULES([LIBMULTIPROCESS], [libmultiprocess], [
  libmultiprocess_found=yes;
  libmultiprocess_prefix=`$PKG_CONFIG --variable=prefix libmultiprocess`;
  ], [true])])
  - fi
  elif test "x$with_libmultiprocess" != xno; then
  AC_MSG_ERROR([--with-libmultiprocess=$with_libmultiprocess value is not yes, auto, or no])
  fi
  