Merge branch 'jk/dev-build-format-security' into maint

Build tweak to help developers.

* jk/dev-build-format-security:
  config.mak.dev: add -Wformat-security

diff --cc config.mak.dev
index 9a99814,bfbd3df..92d2681
--- 1/config.mak.dev
--- 2/config.mak.dev
+++ b/config.mak.dev
@@@ -1,12 -1,8 +1,13 @@@
  ifeq ($(filter no-error,$(DEVOPTS)),)
  CFLAGS += -Werror
  endif
 +ifneq ($(filter pedantic,$(DEVOPTS)),)
 +CFLAGS += -pedantic
 +# don't warn for each N_ use
 +CFLAGS += -DUSE_PARENS_AROUND_GETTEXT_N=0
 +endif
  CFLAGS += -Wdeclaration-after-statement
+ CFLAGS += -Wformat-security
  CFLAGS += -Wno-format-zero-length
  CFLAGS += -Wold-style-definition
  CFLAGS += -Woverflow