Fix extra space

Co-authored-by: Hubert Tong <[email protected]>

Author: daltenty

libcxx/lib/abi/CMakeLists.txt

@@ -18,7 +18,7 @@ function(cxx_abi_list_identifier result triple abi_library abi_version unstable
     string(REGEX REPLACE "freebsd[0-9]+\\.[0-9]+" "freebsd" triple "${triple}")
   elseif("${triple}" MATCHES "aix")
     # Ignore the V.R.M.F version string of aix targets.
-    string(REGEX REPLACE "aix[0-9]+\\.[0-9]+\\.[0-9]+\\.[0-9]+" "aix" triple  "${triple}")
+    string(REGEX REPLACE "aix[0-9]+\\.[0-9]+\\.[0-9]+\\.[0-9]+" "aix" triple "${triple}")
   endif()
   list(APPEND abi_properties "${triple}")
   list(APPEND abi_properties "${abi_library}")