CMake endif mismatch

[filipnavara]

Builds produces this warning:

  CMake Warning (dev) in D:/runtime-pinvoke/eng/native/configureplatform.cmake:
    A logical block opening on the line

      D:/runtime-pinvoke/eng/native/configureplatform.cmake:437 (if)

    closes on the line

      D:/runtime-pinvoke/eng/native/configureplatform.cmake:440 (endif)

    with mis-matching arguments.

runtime/eng/native/configureplatform.cmake

Lines 437 to 440 in 3763fb6

	if(CLR_CMAKE_TARGET_OS STREQUAL emscripten OR CLR_CMAKE_TARGET_OS STREQUAL browser)
	set(CLR_CMAKE_TARGET_UNIX 1)
	set(CLR_CMAKE_TARGET_BROWSER 1)
	endif(CLR_CMAKE_TARGET_OS STREQUAL emscripten)

[filipnavara]

cc @radekdoulik

This was introduced in 82ef541