Kill some warnings.

GNUmakefile

@@ -55,6 +55,7 @@ CFLAGS += \
 	-Wall \
 	-Wextra \
 	-Wno-unused-parameter \
+	-Wno-unknown-warning-option \
 	-MMD \
 	-MP \
 	-ffunction-sections \
@@ -502,6 +503,7 @@ $(UV_OBJS): CFLAGS += \
 	-Wno-unused-result \
 	-Wno-unused-variable
 $(UV_OBJS): CFLAGS := $(filter-out -flto,$(CFLAGS))
+$(filter out/win%,$(UV_OBJS)): CFLAGS += -Wno-cast-function-type
 ifeq ($(UNAME_S),Linux)
 $(UV_OBJS): CFLAGS += \
 	-D_GNU_SOURCE
@@ -577,6 +579,7 @@ ifneq ($(UNAME_S),OpenBSD)
 $(filter-out $(BUILD_DIR)/win%,$(SODIUM_OBJS)): CFLAGS += \
 	-DHAVE_ALLOCA_H
 endif
+$(SODIUM_OBJS): CFLAGS := $(filter-out -flto,$(CFLAGS))
 
 SQLITE_SOURCES := deps/sqlite/sqlite3.c
 SQLITE_OBJS := $(call get_objs,SQLITE_SOURCES)