Building on Fedora 30 is broken

[roskens]

-- Build files have been written to: /src/jrrd2/build
Scanning dependencies of target jrrd2
[ 50%] Building C object CMakeFiles/jrrd2.dir/src/rrd_jinterface.c.o
[100%] Linking C shared module /src/jrrd2/dist/libjrrd2.so
/usr/bin/ld: cannot find -lrrd_th
collect2: error: ld returned 1 exit status
make[2]: *** [CMakeFiles/jrrd2.dir/build.make:84: /src/jrrd2/dist/libjrrd2.so] Error 1
make[1]: *** [CMakeFiles/Makefile2:73: CMakeFiles/jrrd2.dir/all] Error 2
make: *** [Makefile:84: all] Error 2

rrdtool-devel 1.7.1 doesn't include a librrd_th anymore:

$ rpm -ql rrdtool-devel
/usr/include/rrd.h
/usr/include/rrd_client.h
/usr/include/rrd_format.h
/usr/lib64/librrd.so
/usr/lib64/pkgconfig/librrd.pc