Output from failed platform_triplet.c compilation is not logged

Bug report

Bug description:

In #117886, building platform_triplet.c was failing, but the only output in config.log was:

configure:6892: checking for the platform triplet based on compiler characteristics
configure:6900: result: none

At least in the case of failure, the compile command and output should be logged.

CPython versions tested on:

3.13

Operating systems tested on:

macOS

Linked PRs

• gh-134905

从报告中描述的 platform_triplet.c 编译和 configure 入口点开始。将失败构建的命令和输出与当前写入 config.log 的内容进行比较。完成的标准是：失败的编译会记录编译命令及其输出；查看已关联的 PR gh-134905，了解现有工作。