ignore discarded qualifiers warning upon assigning string literal

ccls still shows me the warning and another one for the `diagnostic
ignored` saying `unknown warning group`, not sure if it's fixable in
ccls, might be time to move to clang/d? although I've heard it has
issues too, not sure

modules/sep.c

@@ -23,7 +23,10 @@ semver version(void) { return _version; }
 const char *name(void) { return "sep"; }
 
 static size_t length = 8;
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wdiscarded-qualifiers"
 static char *sep_char = "-";
+#pragma GCC diagnostic pop
 static size_t sep_char_length = 1;
 
 uint8_t init(semver api_ver, char **config) {