rpm macros aren't config files for the administrator, as such they
should be installed into %_rpmmacrodir (ie /usr/lib/rpm/macros.d)
instead of /etc/rpm.

A number of packages still uses /etc/rpm:

R-base: R-core-devel
/etc/rpm/macros.R
gnu-compilers-hpc: gnu-compilers-hpc-macros-devel
/etc/rpm/macros.hpc-gnu
go1.4: go1.4
/etc/rpm/macros.go1.4
golang-packaging: golang-packaging
/etc/rpm/macros.go
kernel-source: kernel-macros
/etc/rpm/macros.kernel-source
mpich-ofi_3_4_2-gnu-hpc: mpich-ofi_3_4_2-gnu-hpc-macros-devel
/etc/rpm/macros.hpc-mpich
mpich_3_4_2-gnu-hpc: mpich_3_4_2-gnu-hpc-macros-devel
/etc/rpm/macros.hpc-mpich
mvapich2-psm2_2_3_6-gnu-hpc: mvapich2-psm2_2_3_6-gnu-hpc-macros-devel
/etc/rpm/macros.hpc-mvapich2
mvapich2-psm_2_3_6-gnu-hpc: mvapich2-psm_2_3_6-gnu-hpc-macros-devel
/etc/rpm/macros.hpc-mvapich2
mvapich2_2_3_6-gnu-hpc: mvapich2_2_3_6-gnu-hpc-macros-devel
/etc/rpm/macros.hpc-mvapich2
netcdf: netcdf-devel-data
/etc/rpm/macros.netcdf
nodejs-packaging: nodejs-packaging
/etc/rpm/macros.nodejs
openmpi1: openmpi1-macros-devel
/etc/rpm/macros.openmpi
openmpi2: openmpi2-macros-devel
/etc/rpm/macros.openmpi
openmpi3: openmpi3-macros-devel
/etc/rpm/macros.openmpi
openmpi_1_10_7-gnu-hpc: openmpi_1_10_7-gnu-hpc-macros-devel
/etc/rpm/macros.hpc-openmpi
openmpi_2_1_6-gnu-hpc: openmpi_2_1_6-gnu-hpc-macros-devel
/etc/rpm/macros.hpc-openmpi
openmpi_3_1_6-gnu-hpc: openmpi_3_1_6-gnu-hpc-macros-devel
/etc/rpm/macros.hpc-openmpi
openstack-macros: openstack-macros
/etc/rpm/macros.openstack-common
/etc/rpm/macros.openstack-suse
yast2-installation-control: yast2-installation-control
/etc/rpm/macros.skelcd