Eliminate the need for a post-patch copy.

Index: tools/flang2/flang2exe/CMakeLists.txt
--- tools/flang2/flang2exe/CMakeLists.txt.orig
+++ tools/flang2/flang2exe/CMakeLists.txt
@@ -88,7 +88,7 @@ set(INCLUDE_DIRS
   ${FLANG_SOURCE_DIR}/lib/scutil
   ${CMAKE_CURRENT_SOURCE_DIR}
   ${CMAKE_CURRENT_BINARY_DIR}
-  ${CMAKE_CURRENT_SOURCE_DIR}/${TARGET_ARCHITECTURE}-${TARGET_OS}
+  ${CMAKE_CURRENT_SOURCE_DIR}/${TARGET_ARCHITECTURE}-Linux
   ${UTILS_SYMTAB_BIN_DIR}        # Symbol table headers
   ${UTILS_ILI_BIN_DIR}           # ILI IR headers
   ${UTILS_ILM_BIN_DIR}           # ILM IR headers
