[issue21076] Turn signal.SIG* constants into enums

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

http://buildbot.python.org/all/builders/AMD64%20Ubuntu%20LTS%203.x/builds/4131/steps/compile/logs/stdio

gcc -pthread   -Xlinker -export-dynamic -o Modules/_testembed Modules/_testembed.o libpython3.5dm.a -lpthread -ldl  -lutil   -lm  
libpython3.5dm.a(config.o):(.data+0x18): undefined reference to `PyInit_signal'
collect2: ld returned 1 exit status
make: *** [Modules/_testembed] Error 1

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nosy: +serhiy.storchaka

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