aot: avoid forcing mmap low addresses on NuttX (#4776)

Signed-off-by: Huang Qi <huangqi3@xiaomi.com>

core/iwasm/aot/aot_loader.c

@@ -307,7 +307,8 @@ loader_mmap(uint32 size, bool prot_exec, char *error_buf, uint32 error_buf_size)
 #if defined(BUILD_TARGET_X86_64) || defined(BUILD_TARGET_AMD_64) \
     || defined(BUILD_TARGET_RISCV64_LP64D)                       \
     || defined(BUILD_TARGET_RISCV64_LP64)
-#if !defined(__APPLE__) && !defined(BH_PLATFORM_LINUX_SGX)
+#if !defined(__APPLE__) && !defined(BH_PLATFORM_LINUX_SGX) \
+    && !defined(BH_PLATFORM_NUTTX)
     /* The mmapped AOT data and code in 64-bit targets had better be in
        range 0 to 2G, or aot loader may fail to apply some relocations,
        e.g., R_X86_64_32/R_X86_64_32S/R_X86_64_PC32/R_RISCV_32.