Build fixes from 2021-09-28's nightly build. (#20435)

https://dev.azure.com/vcpkg/public/_build/results?buildId=60445

PASSING, REMOVE FROM FAIL LIST: soundtouch:x64-windows-static
Probably fixed by: https://github.com/microsoft/vcpkg/pull/19377

REGRESSION: mosquitto:x86-windows
REGRESSION: mosquitto:x64-windows
Probably broken by: https://github.com/microsoft/vcpkg/pull/20148/

```
The following EXEs were found in /bin or /debug/bin. EXEs are not valid distribution targets.

    D:/packages/mosquitto_x86-windows/bin/mosquitto_ctrl.exe

The following EXEs were found in /bin or /debug/bin. EXEs are not valid distribution targets.

    D:/packages/mosquitto_x86-windows/debug/bin/mosquitto_ctrl.exe

Found 2 error(s). Please correct the portfile:
    C:\a\1\s\ports\mosquitto\portfile.cmake
-- Performing post-build validation done
```

The upstream build system has this:

```
option(WITH_CJSON "Build with cJSON support (required for dynamic security plugin and useful for mosquitto_sub)?" ON)
if (WITH_CJSON)
    FIND_PACKAGE(cJSON)
    if (CJSON_FOUND)
	    message(STATUS ${CJSON_FOUND})
    else (CJSON_FOUND)
	    message(STATUS "Optional dependency cJSON not found. Some features will be disabled.")
    endif(CJSON_FOUND)
endif()
```

and indeed, I repro the problem if cjson is installed first. Disable WITH_CJSON as a fix.

OSX never finishing: Hopefully fixed by https://github.com/microsoft/vcpkg/pull/20388

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