cmake AWS_HAVE_EXECINFO examples

pingcap/tiflash contrib/aws-cmake/AwsFeatureTests.cmake :102 

check_c_source_compiles("
    #include <execinfo.h>
    int main() {
        backtrace(NULL, 0);
        return 0;
    }" AWS_HAVE_EXECINFO)

awslabs/aws-c-common cmake/AwsFeatureTests.cmake :107 

check_c_source_compiles("
    #include <execinfo.h>
    #include <stdlib.h>
    int main() {
        backtrace(NULL, 0);
        return 0;
    }" AWS_HAVE_EXECINFO)

ByConity/ByConity contrib/aws-cmake/AwsFeatureTests.cmake :100 

check_c_source_compiles("
    #include <execinfo.h>
    int main() {
        backtrace(NULL, 0);
        return 0;
    }" AWS_HAVE_EXECINFO)