[issue13497] Fix for broken nice test on non-broken platforms with pedantic compilers

[Garrett Cooper]

Garrett Cooper <yanegomi at gmail.com> added the comment:

Other potential issues are provided below:

configure:9015: checking if PTHREAD_SCOPE_SYSTEM is supported
configure:9038: gcc -pthread -o conftest -I/usr/include/edit   conftest.c  >&5
conftest.c: In function 'main':
conftest.c:101: warning: incompatible implicit declaration of built-in function 'exit'
configure:9038: $? = 0

configure:9079: checking if --enable-ipv6 is specified
configure:9119: gcc -pthread -o conftest -I/usr/include/edit   conftest.c  >&5
conftest.c: In function 'main':
conftest.c:102: warning: incompatible implicit declaration of built-in function 'exit'
configure:9119: $? = 0

configure:12462: checking whether wchar_t is signed
configure:12482: gcc -pthread -o conftest -I/usr/include/edit   conftest.c  -lutil >&5
conftest.c: In function 'main':
conftest.c:272: warning: incompatible implicit declaration of built-in function 'exit'
configure:12482: $? = 0

configure:12800: checking whether right shift extends the sign bit
configure:12818: gcc -pthread -o conftest -I/usr/include/edit   conftest.c  -lutil >&5
conftest.c: In function 'main':
conftest.c:273: warning: incompatible implicit declaration of built-in function 'exit'
configure:12818: $? = 0

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<http://bugs.python.org/issue13497>
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