Reduce logs on openlibm and warning on time.h

Makefile

@@ -212,5 +212,5 @@ $(BUILD)/openlibm: openlibm
 	touch $@
 
 $(BUILD)/openlibm/libopenlibm.a: $(BUILD)/openlibm $(BUILD)/release/librelibc.a
-	$(MAKE) AR=$(AR) CC="$(CC_WRAPPER) $(CC)" LD=$(LD) CPPFLAGS="$(CPPFLAGS) -fno-stack-protector -I$(shell pwd)/include -I$(TARGET_HEADERS)" -C $< libopenlibm.a
+	$(MAKE) -s AR=$(AR) CC="$(CC_WRAPPER) $(CC)" LD=$(LD) CPPFLAGS="$(CPPFLAGS) -fno-stack-protector -I$(shell pwd)/include -I$(TARGET_HEADERS)" -C $< libopenlibm.a
 	./renamesyms.sh "$@" "$(BUILD)/release/deps/"

src/header/time/cbindgen.toml

@@ -1,9 +1,12 @@
-sys_includes = ["sys/types.h", "signal.h", "stdint.h", "stddef.h", "features.h"]
+sys_includes = ["sys/types.h", "stdint.h", "stddef.h", "features.h"]
 include_guard = "_RELIBC_TIME_H"
 language = "C"
 style = "Tag"
 no_includes = true
 cpp_compat = true
+after_includes = """
+struct sigevent;
+"""
 
 [enum]
 prefix_with_name = true