compilers: quiet ICC messages about pch

These are useful for debugging, but not interesting for end users, where
it just adds lines between ninja jobs without adding value.

mesonbuild/compilers/c.py

@@ -1245,7 +1245,7 @@ class IntelCCompiler(IntelCompiler, CCompiler):
         CCompiler.__init__(self, exelist, version, is_cross, exe_wrapper, **kwargs)
         IntelCompiler.__init__(self, compiler_type)
         self.lang_header = 'c-header'
-        default_warn_args = ['-Wall', '-w3', '-diag-disable:remark', '-Wpch-messages']
+        default_warn_args = ['-Wall', '-w3', '-diag-disable:remark']
         self.warn_args = {'1': default_warn_args,
                           '2': default_warn_args + ['-Wextra'],
                           '3': default_warn_args + ['-Wextra']}