Add the right guards

Author: vinay-deshmukh

libc/src/stdio/scanf_core/CMakeLists.txt

@@ -71,8 +71,7 @@ add_header_library(
     libc.src.__support.macros.attributes
     libc.hdr.types.FILE
     libc.src.__support.File.file
-  COMPILE_OPTIONS
-    ${use_system_file}
+  ${use_system_file}
 )
 endif()
 
@@ -129,7 +128,6 @@ elseif(TARGET libc.src.__support.File.file OR (NOT LLVM_LIBC_FULL_BUILD))
       libc.include.stdio
       libc.src.__support.File.file
       libc.src.__support.arg_list
-    COMPILE_OPTIONS
     ${use_system_file}
   )
 endif()

libc/src/stdio/scanf_core/reader.h

@@ -10,7 +10,11 @@
 #define LLVM_LIBC_SRC_STDIO_SCANF_CORE_READER_H
 
 #include "hdr/types/FILE.h"
+
+#ifndef LIBC_COPT_STDIO_USE_SYSTEM_FILE
 #include "src/__support/File/file.h"
+#endif
+
 #include "src/__support/macros/attributes.h" // For LIBC_INLINE
 #include "src/__support/macros/config.h"