Ever since !236 (merged), srt fails to build on Windows with:

[661/767] cl @ext/srt/3332748@@gstsrt@sha/gstsrtsrc.c.obj.rsp
FAILED: ext/srt/3332748@@gstsrt@sha/gstsrtsrc.c.obj
cl @ext/srt/3332748@@gstsrt@sha/gstsrtsrc.c.obj.rsp
c:\code\cerbero\build\dist\msvc_x86_64\include\srt\logging_api.h(27): fatal error C1083: Cannot open include file: 'pthread.h': No such file or directory
[662/767] cl @ext/srt/3332748@@gstsrt@sha/gstsrtsink.c.obj.rsp
FAILED: ext/srt/3332748@@gstsrt@sha/gstsrtsink.c.obj
cl @ext/srt/3332748@@gstsrt@sha/gstsrtsink.c.obj.rsp
c:\code\cerbero\build\dist\msvc_x86_64\include\srt\logging_api.h(27): fatal error C1083: Cannot open include file: 'pthread.h': No such file or directory
[663/767] cl @ext/webrtc/80fc528@@gstwebrtc@sha/gstwebrtcice.c.obj.rsp
[664/767] cl @ext/srt/3332748@@gstsrt@sha/gstsrtobject.c.obj.rsp
FAILED: ext/srt/3332748@@gstsrt@sha/gstsrtobject.c.obj
cl @ext/srt/3332748@@gstsrt@sha/gstsrtobject.c.obj.rsp
c:\code\cerbero\build\dist\msvc_x86_64\include\srt\logging_api.h(27): fatal error C1083: Cannot open include file: 'pthread.h': No such file or directory
[665/767] cl @ext/srt/3332748@@gstsrt@sha/gstsrt.c.obj.rsp
FAILED: ext/srt/3332748@@gstsrt@sha/gstsrt.c.obj
cl @ext/srt/3332748@@gstsrt@sha/gstsrt.c.obj.rsp
c:\code\cerbero\build\dist\msvc_x86_64\include\srt\logging_api.h(27): fatal error C1083: Cannot open include file: 'pthread.h': No such file or directory