[osx] -Wpedantic can not be enabled as we use a GNU extension

[k4rtik]

If I add -pedantic/-Wpedantic to the Makefile, I receive the following errors:

$ make
cc -fPIC -Wall -Werror -Wunused -Wextra -Wpedantic -O0 -g -std=c11 -fprofile-arcs -ftest-coverage   -c -o common.o common.c
In file included from common.c:5:
./common.h:36:14: error: token pasting of ',' and __VA_ARGS__ is a GNU extension [-Werror,-Wgnu-zero-variadic-macro-arguments]
    log_err(M, ##__VA_ARGS__);                                                 \
             ^
./common.h:25:55: error: token pasting of ',' and __VA_ARGS__ is a GNU extension [-Werror,-Wgnu-zero-variadic-macro-arguments]
          __LINE__, __FUNCTION__, errno, clean_errno(), ##__VA_ARGS__)
                                                      ^
./common.h:36:14: error: token pasting of ',' and __VA_ARGS__ is a GNU extension [-Werror,-Wgnu-zero-variadic-macro-arguments]
    log_err(M, ##__VA_ARGS__);                                                 \
             ^
./common.h:25:55: error: token pasting of ',' and __VA_ARGS__ is a GNU extension [-Werror,-Wgnu-zero-variadic-macro-arguments]
          __LINE__, __FUNCTION__, errno, clean_errno(), ##__VA_ARGS__)
                                                      ^
4 errors generated.
make: *** [common.o] Error 1

No clean solution exists. See: https://stackoverflow.com/questions/5588855/standard-alternative-to-gccs-va-args-trick