[libc] support scudo in uefi

Author: RossComputerGuy

libc/config/uefi/entrypoints.txt

@@ -447,6 +447,13 @@ if(LIBC_COMPILER_HAS_FIXED_POINT)
   )
 endif()
 
+if(LLVM_LIBC_INCLUDE_SCUDO)
+  list(APPEND TARGET_LIBC_ENTRYPOINTS
+    # malloc.h external entrypoints
+    libc.src.stdlib.mallopt
+  )
+endif()
+
 set(TARGET_LLVMLIBC_ENTRYPOINTS
   ${TARGET_LIBC_ENTRYPOINTS}
   ${TARGET_LIBM_ENTRYPOINTS}