Merge BoringSSL d9e8173: Fix several warnings that arise in Android.

crypto/poly1305/poly1305_arm.c

@@ -132,7 +132,7 @@ static uint32_t load32(uint8_t *t) {
 
 static void fe1305x2_frombytearray(fe1305x2 *r, const uint8_t *x,
                                    unsigned long long xlen) {
-  int i;
+  unsigned i;
   uint8_t t[17];
 
   for (i = 0; (i < 16) && (i < xlen); i++) {

mk/top_of_makefile.mk

@@ -170,6 +170,7 @@ CPPFLAGS += \
   -Wfloat-equal \
   -Wformat=2 \
   -Winvalid-pch \
+  -Wmissing-field-initializers \
   -Wmissing-include-dirs \
   -Wredundant-decls \
   -Wsign-compare \
@@ -191,6 +192,7 @@ endif
 #   -Wold-style-definition
 CFLAGS += \
   -Wbad-function-cast \
+  -Wmissing-field-initializers \
   -Wnested-externs \
   -Wstrict-prototypes \
   $(NULL)