Tests/CXXModules: remove unused file

Tests/RunCMake/CXXModules/InstallBMINoGenericArgs-check.cmake

@@ -1,8 +0,0 @@
-file(READ "${RunCMake_TEST_BINARY_DIR}/cmake_install.cmake" install_script)
-
-if (install_script MATCHES [[include\("[^)]*/CMakeFiles/install-bmi-generic-args\.dir/install-cxx-module-bmi-[^.]*\.cmake" OPTIONAL\)]])
-  list(APPEND RunCMake_TEST_FAILED
-    "Found BMI install script inclusion")
-endif ()
-
-string(REPLACE ";" "; " RunCMake_TEST_FAILED "${RunCMake_TEST_FAILED}")