build: disable clang's tautological compare warnings

This silences two non issues in the client.c file. Fixing them as clang would
want us to, would introduce security bugs and potential crashes.

waftools/detections/compiler.py

@@ -25,6 +25,8 @@ def __add_gcc_flags__(ctx):
                        "-Wno-switch", "-Wno-parentheses", "-Wpointer-arith",
                        "-Wredundant-decls", "-Wno-pointer-sign",
                        "-Werror=implicit-function-declaration",
+                       "-Wno-tautological-compare",
+                       "-Wno-tautological-constant-out-of-range-compare",
                        "-Wno-error=deprecated-declarations",
                        "-Wno-error=unused-function" ]