Disable FPU in NuttX spec test (bytecodealliance#2781)

Fix spec test failure on NuttX with bytecodealliance#2780, see:
https://github.com/bytecodealliance/wasm-micro-runtime/actions/runs/6910450452

.github/workflows/spec_test_on_nuttx.yml

@@ -4,6 +4,12 @@
 name: spec test on nuttx
 
 on:
+  pull_request:
+    types:
+      - closed
+    branches:
+      - main
+
   schedule:
     - cron:  '0 0 * * *'
 
@@ -104,6 +110,11 @@ jobs:
           find nuttx/boards -name defconfig | xargs sed -i '$a\CONFIG_INTERPRETERS_WAMR=y\nCONFIG_INTERPRETERS_WAMR_STACKSIZE=32768\nCONFIG_INTERPRETERS_WAMR_AOT=y\nCONFIG_INTERPRETERS_WAMR_FAST=y\nCONFIG_INTERPRETERS_WAMR_LOG=y\nCONFIG_INTERPRETERS_WAMR_LIBC_BUILTIN=y\nCONFIG_INTERPRETERS_WAMR_REF_TYPES=y\nCONFIG_INTERPRETERS_WAMR_ENABLE_SPEC_TEST=y\nCONFIG_INTERPRETERS_WAMR_SHARED_MEMORY=y\nCONFIG_INTERPRETERS_WAMR_BULK_MEMORY=y\n'
           find nuttx/boards -name defconfig | xargs sed -i '$a\CONFIG_EOL_IS_LF=y\nCONFIG_ARM_SEMIHOSTING_HOSTFS=y\nCONFIG_ARM_SEMIHOSTING_HOSTFS_CACHE_COHERENCE=y\nCONFIG_RISCV_SEMIHOSTING_HOSTFS=y\nCONFIG_FS_HOSTFS=y\nCONFIG_LIBC_FLOATINGPOINT=y\n'
 
+      - name: Enable additional features for NuttX on RI5C-V
+        if: startsWith(matrix.nuttx_board_config, 'boards/risc-v')
+        run: |
+          find nuttx/boards -name defconfig | xargs sed -i '$a\# CONFIG_ARCH_FPU is not set\n'
+
       - name: Build wamrc
         working-directory: apps/interpreters/wamr/wamr/wamr-compiler
         run: |
@@ -133,7 +144,7 @@ jobs:
           tar xvf xpack-qemu-riscv.tar.gz
           export PATH=$PATH:$PWD/xpack-qemu-riscv-7.1.0-1/bin
           cd apps/interpreters/wamr/wamr/tests/wamr-test-suites
-          ./test_wamr.sh -s spec ${{ matrix.wamr_test_option }} -m RISCV32 -b -Q -P -F ${{ env.firmware }}
+          ./test_wamr.sh -s spec ${{ matrix.wamr_test_option }} -m riscv32 -b -Q -P -F ${{ env.firmware }}
 
       - name: Test on RISCV64
         if: endsWith(matrix.nuttx_board_config, 'rv-virt/configs/nsh64')