Fix broken Windows compilation on master
It looks like the split_or_directory branch broke Windows compilation:
x86_64-w64-mingw32-gcc -IC:/msys64/mingw64/include -g -O2 -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=2 -fstack-protector-all -Wstack-protector --param ssp-buffer-size=1 -fasynchronous-unwind-tables -Wall -fno-strict-aliasing -Waddress -Warray-bounds -Wdate-time -Wdouble-promotion -Wduplicate-decl-specifier -Wduplicated-cond -Wextra -Wfloat-conversion -Wignored-attributes -Wimplicit-fallthrough -Winit-self -Wlogical-op -Wmissing-field-initializers -Wmissing-format-attribute -Wmissing-noreturn -Wnormalized=nfkc -Wnull-dereference -Woverlength-strings -Woverride-init -Wshadow -Wshift-count-negative -Wshift-count-overflow -Wshift-negative-value -Wshift-overflow=2 -Wsizeof-array-argument -Wstrict-overflow=1 -Wsuggest-attribute=format -Wsuggest-attribute=noreturn -Wswitch-bool -Wsync-nand -Wtrampolines -Wunused-but-set-parameter -Wunused-but-set-variable -Wunused-const-variable=2 -Wunused-local-typedefs -Wvariadic-macros -W -Wfloat-equal -Wundef -Wpointer-arith -Wstrict-prototypes -Wmissing-prototypes -Wwrite-strings -Wredundant-decls -Wchar-subscripts -Wcomment -Wformat=2 -Wwrite-strings -Wnested-externs -Wbad-function-cast -Wswitch-enum -Waggregate-return -Wpacked -Wunused -Wunused-parameter -Wold-style-definition -Wmissing-declarations -Werror -L/c/OpenSSL-Win64/lib -Wl,--nxcompat -Wl,--dynamicbase -o src/test/bench.exe src/test/bench.o src/core/libtor-app.a src/lib/libtor-compress.a src/lib/libtor-evloop.a src/lib/libtor-tls.a src/lib/libtor-crypt-ops.a src/ext/keccak-tiny/libkeccak-tiny.a src/lib/libcurve25519_donna.a src/ext/ed25519/ref10/libed25519_ref10.a src/ext/ed25519/donna/libed25519_donna.a src/lib/libtor-process.a src/lib/libtor-time.a src/lib/libtor-fs.a src/lib/libtor-encoding.a src/lib/libtor-sandbox.a src/lib/libtor-container.a src/lib/libtor-net.a src/lib/libtor-thread.a src/lib/libtor-memarea.a src/lib/libtor-math.a src/lib/libtor-meminfo.a src/lib/libtor-osinfo.a src/lib/libtor-log.a src/lib/libtor-lock.a src/lib/libtor-fdio.a src/lib/libtor-string.a src/lib/libtor-term.a src/lib/libtor-smartlist-core.a src/lib/libtor-malloc.a src/lib/libtor-wallclock.a src/lib/libtor-err.a src/lib/libtor-intmath.a src/lib/libtor-ctime.a src/trunnel/libor-trunnel.a src/lib/libtor-trace.a -lz -levent -lssl -lcrypto -lws2_32 -liphlpapi -lgdi32 -luserenv -LC:/msys64/mingw64/lib -llzma
bash.exe : src/core/libtor-app.a(main.o): In function `run_main_loop_once':
At line:2 char:5
+ & $commandPath $args 2>&1
+ ~~~~~~~~~~~~~~~~~~~~~~~~~
+ CategoryInfo : NotSpecified: (src/core/libtor...ain_loop_once'::String) [], RemoteException
+ FullyQualifiedErrorId : NativeCommandError
C:\projects\tor\x86_64-w64-mingw32/../src/core/mainloop/main.c:2990: undefined reference to `nt_service_is_stopping'
src/core/libtor-app.a(main.o): In function `tor_run_main':
C:\projects\tor\x86_64-w64-mingw32/../src/core/mainloop/main.c:4247: undefined reference to `nt_service_parse_options'
C:\projects\tor\x86_64-w64-mingw32/../src/core/mainloop/main.c:4277: undefined reference to `nt_service_set_state'
collect2.exe: error: ld returned 1 exit status
make: *** [Makefile:6751: src/test/bench.exe] Error 1
make: *** Waiting for unfinished jobs....
Command executed with exception: make: *** Waiting for unfinished jobs....
https://ci.appveyor.com/project/torproject/tor/build/1.0.308/job/xxtbvepsfyif49sc