Fix the path to VERSION.txt used in CMake.

Fixes a bug introduced in #1320.

Author: grynspan

cmake/modules/shared/CompilerSettings.cmake

@@ -43,7 +43,7 @@ if(CMAKE_SYSTEM_NAME STREQUAL "WASI")
   add_compile_definitions("SWT_NO_PIPES")
 endif()
 
-file(STRINGS "../VERSION.txt" SWT_TESTING_LIBRARY_VERSION LIMIT_COUNT 1)
+file(STRINGS "${PROJECT_SOURCE_DIR}/VERSION.txt" SWT_TESTING_LIBRARY_VERSION LIMIT_COUNT 1)
 if(SWT_TESTING_LIBRARY_VERSION)
   message(STATUS "Swift Testing version: ${SWT_TESTING_LIBRARY_VERSION}")
   add_compile_definitions("$<$<COMPILE_LANGUAGE:CXX>:SWT_TESTING_LIBRARY_VERSION=\"${SWT_TESTING_LIBRARY_VERSION}\">")