Fix -Werror flags, build fails with them

--- a/CMakeScripts/DefineDependsandFlags.cmake
+++ b/CMakeScripts/DefineDependsandFlags.cmake
@@ -39,8 +39,6 @@
 
 # Errors for common mistakes
 list(APPEND INKSCAPE_CXX_FLAGS "-fstack-protector-strong")
-list(APPEND INKSCAPE_CXX_FLAGS "-Werror=format")                # e.g.: printf("%s", std::string("foo"))
-list(APPEND INKSCAPE_CXX_FLAGS "-Werror=format-security")       # e.g.: printf(variable);
 list(APPEND INKSCAPE_CXX_FLAGS "-Werror=ignored-qualifiers")    # e.g.: const int foo();
 list(APPEND INKSCAPE_CXX_FLAGS "-Werror=return-type")           # non-void functions that don't return a value
 list(APPEND INKSCAPE_CXX_FLAGS "-Wno-switch")                   # See !849 for discussion