distcc fails to build with gcc 10:

gcc -pthread -Wno-unused-result -Wsign-compare -DDYNAMIC_ANNOTATIONS_ENABLED=1 -DNDEBUG -O2 -g -pipe -Wall -Werror=format-security -Wp,-D_FORTIFY_SOURCE=2 -Wp,-D_GLIBCXX_ASSERTIONS -fexceptions -fstack-protector-strong -grecord-gcc-switches -m64 -mtune=generic -fasynchronous-unwind-tables -fstack-clash-protection -fcf-protection -D_GNU_SOURCE -fPIC -fwrapv -O2 -g -pipe -Wall -Werror=format-security -Wp,-D_FORTIFY_SOURCE=2 -Wp,-D_GLIBCXX_ASSERTIONS -fexceptions -fstack-protector-strong -grecord-gcc-switches -m64 -mtune=generic -fasynchronous-unwind-tables -fstack-clash-protection -fcf-protection -D_GNU_SOURCE -fPIC -fwrapv -O2 -g -pipe -Wall -Werror=format-security -Wp,-D_FORTIFY_SOURCE=2 -Wp,-D_GLIBCXX_ASSERTIONS -fexceptions -fstack-protector-strong -grecord-gcc-switches -m64 -mtune=generic -fasynchronous-unwind-tables -fstack-clash-protection -fcf-protection -D_GNU_SOURCE -fPIC -fwrapv -O2 -g -pipe -Wall -Werror=format-security -Wp,-D_FORTIFY_SOURCE=2 -Wp,-D_GLIBCXX_ASSERTIONS -fexceptions -fstack-protector-strong -grecord-gcc-switches -specs=/usr/lib/rpm/redhat/redhat-hardened-cc1 -specs=/usr/lib/rpm/redhat/redhat-annobin-cc1 -m64 -mtune=generic -fasynchronous-unwind-tables -fstack-clash-protection -fcf-protection -MD -W -Wall -Wimplicit -Wshadow -Wpointer-arith -Wcast-align -Wwrite-strings -Waggregate-return -Wstrict-prototypes -Wmissing-prototypes -Wnested-externs -Wmissing-declarations -Wuninitialized -D_REENTRANT -pthread -Wno-missing-prototypes -Wno-missing-declarations -Wno-write-strings -DMINILZO_HAVE_CONFIG_H -DHAVE_CONFIG_H -D_GNU_SOURCE -DLIBDIR=/usr/lib64 -DSYSCONFDIR=/etc -DPKGDATADIR=/usr/share/distcc -Isrc -I./src -I./lzo -fPIC -D_GNU_SOURCE=1 -Isrc -I./src -I./lzo -I/usr/include/python3.9 -c /builddir/build/BUILD/distcc-3.3.3/include_server/c_extensions/distcc_pump_c_extensions_module.c -o ./_include_server/builddir/build/BUILD/distcc-3.3.3/include_server/c_extensions/distcc_pump_c_extensions_module.o
gcc -O2 -g -pipe -Wall -Werror=format-security -Wp,-D_FORTIFY_SOURCE=2 -Wp,-D_GLIBCXX_ASSERTIONS -fexceptions -fstack-protector-strong -grecord-gcc-switches -specs=/usr/lib/rpm/redhat/redhat-hardened-cc1 -specs=/usr/lib/rpm/redhat/redhat-annobin-cc1 -m64 -mtune=generic -fasynchronous-unwind-tables -fstack-clash-protection -fcf-protection -MD -W -Wall -Wimplicit -Wshadow -Wpointer-arith -Wcast-align -Wwrite-strings -Waggregate-return -Wstrict-prototypes -Wmissing-prototypes -Wnested-externs -Wmissing-declarations -Wuninitialized -D_REENTRANT  -pthread -Wl,-z,relro -Wl,--as-needed  -Wl,-z,now -specs=/usr/lib/rpm/redhat/redhat-hardened-ld -o distccd src/access.o src/daemon.o  src/dopt.o src/dparent.o src/dsignal.o src/ncpus.o src/prefork.o src/stringmap.o src/serve.o src/setuid.o src/srvnet.o src/srvrpc.o src/state.o src/stats.o src/fix_debug_info.o src/zeroconf-reg.o src/auth_distccd.o src/arg.o src/argutil.o src/cleanup.o src/compress.o src/trace.o src/util.o src/io.o src/exec.o src/rpc.o src/tempfile.o src/bulk.o src/help.o src/filename.o src/lock.o src/netutil.o src/pump.o src/sendfile.o src/safeguard.o src/snprintf.o src/timeval.o src/dotd.o src/hosts.o src/hostfile.o src/implicit.o src/loadfile.o lzo/minilzo.o src/zeroconf.o src/gcc-id.o src/auth_common.o  -lgssapi_krb5 -liberty -lpopt -lpopt  -lavahi-common -lavahi-client 	
/usr/bin/ld: src/serve.o:/builddir/build/BUILD/distcc-3.3.3/src/stats.h:36: multiple definition of `stats_text'; src/prefork.o:/builddir/build/BUILD/distcc-3.3.3/src/stats.h:36: first defined here
/usr/bin/ld: src/stats.o:/builddir/build/BUILD/distcc-3.3.3/src/stats.h:36: multiple definition of `stats_text'; src/prefork.o:/builddir/build/BUILD/distcc-3.3.3/src/stats.h:36: first defined here
collect2: error: ld returned 1 exit status
make: *** [Makefile:508: distccd] Error 1

This blocks the Python 3.9 rebuild of the package.

See https://lists.fedoraproject.org/archives/list/devel@lists.fedoraproject.org/thread/RYVPP45PMWPXYBBDKXO3CI7YGL7CDQG6/ and https://gcc.gnu.org/gcc-10/porting_to.html#common for more information about the failure.