fix build on gcc-10 (-fno-common) #30
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gcc-10 changed the default from -fcommon to fno-common: https://gcc.gnu.org/PR85678 As a result build fails as: ld: src/util.c.1.o:/build/pflask/build/../src/printf.h:42: multiple definition of `use_syslog'; src/cgroup.c.1.o:/build/pflask/build/../src/printf.h:42: first defined here
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gcc-10 changed the default from -fcommon to fno-common:
https://gcc.gnu.org/PR85678
As a result build fails as: