Remove deprecated -check-printf-calls dflag for LDC

It's deprecated since LDC v1.31, as `pragma(printf)` (used by
core.stdc.stdio) is much better and supported by all compilers.
Additionally, I haven't found a single printf occurrence in this
repo here.

Author: kinke

dub.json

@@ -18,7 +18,6 @@
     "importPaths": ["."],
     "dflags": ["-ignore"],
     "dflags-gdc": ["-ggdb"],
-    "dflags-ldc": ["-check-printf-calls"],
     "configurations": [
         {
             "name": "default"

wscript

@@ -62,7 +62,6 @@ def configure(conf):
         add_option('-wi')
         add_option('-ignore')
         add_option('-property')
-        add_option('-check-printf-calls')
         add_option('-g')
 
         if conf.options.mode == 'debug':