fixes compile error on mac

In file included from /usr/include/nl_types.h:45:
/usr/include/sys/types.h:92:23: error: cannot combine with previous 'int' declaration specifier
typedef unsigned int            uint;           /* Sys V compatibility */
                                ^
/.../clpeak/src/include/common.h:16:34: note: expanded from macro 'uint'
                                 ^
1 error generated.