crt: Specify missing lib32/kernel32.def dependency for lib32/libkernel32.a

This will ensure that 'make' will rebuild lib32/libkernel32.a after changing lib32/kernel32.def file.

Signed-off-by: LIU Hao <lh_mouse@126.com>

mingw-w64-crt/Makefile.am

diff --git a/mingw-w64-crt/Makefile.am b/mingw-w64-crt/Makefile.am
index 9b5ef0f..3da0d1a 100644
--- a/mingw-w64-crt/Makefile.am
+++ b/mingw-w64-crt/Makefile.am
@@ -1466,6 +1466,7 @@
 lib32_libkernel32_a_SOURCES = $(src_intrincs) $(src_intrincs32)
 lib32_libkernel32_a_AR = $(DTLIB32) && $(AR) $(ARFLAGS)
 lib32_libkernel32_a_CPPFLAGS=$(CPPFLAGS32) $(extra_include)
+EXTRA_lib32_libkernel32_a_DEPENDENCIES=lib32/kernel32.def
 
 lib32_DATA =
 if !W32API