Merge branch 'jk/struct-zero-init-with-older-gcc' into maint

Older gcc with -Wall complains about the universal zero initializer
"struct s = { 0 };" idiom, which makes developers' lives
inconvenient (as -Werror is enabled by DEVELOPER=YesPlease).  The
build procedure has been tweaked to help these compilers.
source: <[email protected]>

* jk/struct-zero-init-with-older-gcc:
  config.mak.dev: squelch -Wno-missing-braces for older gcc

Author: gitster

config.mak.dev

@@ -59,9 +59,13 @@ endif
 
 # uninitialized warnings on gcc 4.9.2 in xdiff/xdiffi.c and config.c
 # not worth fixing since newer compilers correctly stop complaining
+#
+# Likewise, gcc older than 4.9 complains about initializing a
+# struct-within-a-struct using just "{ 0 }"
 ifneq ($(filter gcc4,$(COMPILER_FEATURES)),)
 ifeq ($(filter gcc5,$(COMPILER_FEATURES)),)
 DEVELOPER_CFLAGS += -Wno-uninitialized
+DEVELOPER_CFLAGS += -Wno-missing-braces
 endif
 endif