New issue by 4ricci on void-packages repository

https://github.com/void-linux/void-packages/issues/31646

Description:
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### System

* xuname: Void 5.12.12_1 x86_64 GenuineIntel uptodate rrFFFFF
* package: transmission-3.00_5

### Actual behavior
`./xbps-src configure transmission` gives the error:
```
CMake Error at libtransmission/CMakeLists.txt:312 (add_executable):
  Cannot find source file:

    subprocess-test.cmd

  Tried extensions .c .C .c++ .cc .cpp .cxx .cu .mpp .m .M .mm .h .hh .h++
  .hm .hpp .hxx .in .txx .f .F .for .f77 .f90 .f95 .f03 .ispc


CMake Error at libtransmission/CMakeLists.txt:312 (add_executable):
  No SOURCES given to target: transmission-test-subprocess


CMake Generate step failed.  Build files cannot be regenerated correctly.
=> ERROR: transmission-3.00_5: do_configure: 'CFLAGS="${CFLAGS/ -pipe / }" CXXFLAGS="${CXXFLAGS/ -pipe / }" cmake ${cmake_args} ${configure_args} ${wrksrc}/${build_wrksrc}' exited with 1
=> ERROR:   in do_configure() at common/build-style/cmake.sh:67
```

The same command works fine after checking out 4b97cd2fb4ec38712544438c2491b6d7d5ab334a, so the problem was introduced in 4f75cf25fdade57da4d7e960b067576cd294e463.