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2e9aa5f56c
The nds32 & spu dirs are using compile tests to look for some preprocessor defines, but we don't need to compile the code, just preprocess it. So switch to AC_PREPROC_IFELSE. The sh dir is using a preprocessor test via grep, but let's switch it to AC_PREPROC_IFELSE too to be consistent. This should allow us to drop the uncommon AC_NO_EXECUTABLES call.