Build failure with glibc 2.28, released Aug 1

[jamespharvey20]

As of glibc 2.28:

• The macros 'major', 'minor', and 'makedev' are now only available from
  the header <sys/sysmacros.h>; not from <sys/types.h> or various other
  headers that happen to include <sys/types.h>. These macros are rarely
  used, not part of POSIX nor XSI, and their names frequently collide with
  user code; see https://sourceware.org/bugzilla/show_bug.cgi?id=19239 for
  further explanation.

  <sys/sysmacros.h> is a GNU extension. Portable programs that require
  these macros should first include <sys/types.h>, and then include
  <sys/sysmacros.h> if GNU_LIBRARY is defined.

This causes:

ipath_proto.c: In function ‘ipath_userinit’:
ipath_proto.c:539:32: error: implicit declaration of function ‘minor’; did you mean ‘mincore’? [-Werror=implicit-function-declaration]
     spctrl->spc_dev.spd_type = minor(st.st_rdev);
                                ^~~~~
                                mincore