Fix clang 10.0.0 errors
xkbcomp.c:228:37: error: result of comparison against a string literal is unspecified (use an explicit string comparison function instead) [-Werror,-Wstring-compare]
if ((argv[i][0] != '-') || (uStringEqual(argv[i], "-")))
^~~~~~~~~~~~~~~~~~~~~~~~~~
./utils.h:195:30: note: expanded from macro 'uStringEqual'
^~~~~~~~~~~~~~~~~~~~~
./utils.h:198:38: note: expanded from macro 'uStringCompare'
(s1)!=(s2):strcmp(s1,s2))
^ ~~~~
Don't attempt to do this macro trickery, and simply use strcmp instead, where it applies.
Edited by Dimitry Andric