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The rtkaio build should no longer define IN_MODULE, this was a workaround at one point to include itself in the librt symbol set, but all we need is MODULE_NAME for the final set of patches. Therefore removing `-UIN_MODULE -DIN_MODULE=MODULE_librt` and verifying that the ABI does not change (use libabigail) then it should be fine.

e.g.

In file included from <command-line>:0:0:
./../include/libc-symbols.h:23:0: warning: "IN_MODULE" redefined [enabled by default]
 #define IN_MODULE PASTE_NAME (MODULE_, MODULE_NAME)
 ^

rtkaio/Makefile:

 72 CPPFLAGS-librtkaio += -UIN_MODULE -DIN_MODULE=MODULE_librt \
 73                       -UMODULE_NAME -DMODULE_NAME=librt \
 74                       -UIS_IN_librt -DIS_IN_librt=1 \
 75                       -I$(..)rt

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHSA-2018:3092