Include libdeflate.def in Windows releases

... just in case someone needs it.

.gitignore

@@ -1,4 +1,5 @@
 *.a
+*.def
 *.dll
 *.dylib
 *.exe

Makefile

@@ -73,6 +73,7 @@ ifneq ($(findstring -mingw,$(shell $(CC) -dumpmachine 2>/dev/null)),)
     SHARED_LIB_SYMLINK :=
     SHARED_LIB_CFLAGS  :=
     SHARED_LIB_LDFLAGS := -Wl,--out-implib,libdeflate.lib \
+                          -Wl,--output-def,libdeflate.def \
                           -Wl,--add-stdcall-alias
     PROG_SUFFIX        := .exe
     PROG_CFLAGS        := -static -municode
@@ -318,7 +319,7 @@ clean:
 		lib/*.dllobj lib/*/*.dllobj \
 		programs/*.o programs/*.obj \
 		$(DEFAULT_TARGETS) $(TEST_PROGRAMS) programs/config.h \
-		libdeflate.lib libdeflatestatic.lib \
+		libdeflate.lib libdeflate.def libdeflatestatic.lib \
 		.lib-cflags .prog-cflags
 
 realclean: clean

tools/make-windows-releases

@@ -9,8 +9,7 @@ for arch in 'i686' 'x86_64'; do
 	dir=libdeflate-$(git describe --tags | tr -d v)-windows-${arch}-bin
 	rm -rf $dir ${dir}.zip
 	mkdir $dir
-	cp libdeflate.dll libdeflate.lib libdeflatestatic.lib \
-		libdeflate.h *.exe $dir
+	cp libdeflate.{dll,lib,def} libdeflatestatic.lib libdeflate.h *.exe $dir
 	${arch}-w64-mingw32-strip ${dir}/libdeflate.dll ${dir}/*.exe
 	for file in COPYING NEWS; do
 		sed < $file > ${dir}/${file}.txt -e 's/$/\r/g'