[libcxxabi, libunwind] [test] Quote the python path properly for LIB*_EXECUTOR

[mstorsjo]

Summary

This is the same as c218c80c730a14a1cbcebd588b18220a879702c6,
but for libcxxabi and libunwind.

This fixes running tests on Windows with Python installed in "C:\Program Files\Python".

[phosek]

LGTM

libcxxabi/test/CMakeLists.txt

 include(AddLLVM) # for configure_lit_site_cfg and add_lit_testsuite
 macro(pythonize_bool var)
   if (${var})
     set(${var} True)
   else()
     set(${var} False)
   endif()
 endmacro()
 
 pythonize_bool(LIBCXXABI_USE_LLVM_UNWINDER)
-set(LIBCXXABI_EXECUTOR "${Python3_EXECUTABLE} ${LIBCXXABI_LIBCXX_PATH}/utils/run.py" CACHE STRING
+set(LIBCXXABI_EXECUTOR "\\\"${Python3_EXECUTABLE}\\\" ${LIBCXXABI_LIBCXX_PATH}/utils/run.py" CACHE STRING
     "Executor to use when running tests.")
 
 if (LIBCXXABI_ENABLE_SHARED)
   set(LIBCXXABI_TEST_DEPS cxxabi_shared)
 else()
   set(LIBCXXABI_TEST_DEPS cxxabi_static)
 endif()
 

libunwind/test/CMakeLists.txt

 include(AddLLVM) # for add_lit_testsuite
 macro(pythonize_bool var)
   if (${var})
     set(${var} True)
   else()
     set(${var} False)
   endif()
 endmacro()
 
 pythonize_bool(LIBUNWIND_ENABLE_CET)
 pythonize_bool(LIBUNWIND_ENABLE_THREADS)
 pythonize_bool(LIBUNWIND_USES_ARM_EHABI)
-set(LIBUNWIND_EXECUTOR "${Python3_EXECUTABLE} ${LIBUNWIND_LIBCXX_PATH}/utils/run.py" CACHE STRING
+set(LIBUNWIND_EXECUTOR "\\\"${Python3_EXECUTABLE}\\\" ${LIBUNWIND_LIBCXX_PATH}/utils/run.py" CACHE STRING
     "Executor to use when running tests.")
 
 set(AUTO_GEN_COMMENT "## Autogenerated by libunwind configuration.\n# Do not edit!")
 set(SERIALIZED_LIT_PARAMS "# Lit parameters serialized here for llvm-lit to pick them up\n")
 
 macro(serialize_lit_param param value)
   string(APPEND SERIALIZED_LIT_PARAMS "config.${param} = ${value}\n")
 endmacro()