package/file: zlib is optional, not mandatory

zlib is optional since version 4.22 and
https://github.com/file/file/commit/b950f1f426f8855e69d6f3dcc32067e931e015b7
and --enable-zlib has been fixed since version 5.37 and
https://github.com/file/file/commit/8c6dcd7ef690e90a3e897e8f886513750ed2c04d

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>

package/file/Config.in

@@ -1,6 +1,5 @@
 config BR2_PACKAGE_FILE
 	bool "file"
-	select BR2_PACKAGE_ZLIB
 	help
 	  Program to identify a file's format by scanning binary data
 	  for known patterns.

package/file/file.mk

@@ -6,7 +6,7 @@
 
 FILE_VERSION = 5.38
 FILE_SITE = ftp://ftp.astron.com/pub/file
-FILE_DEPENDENCIES = host-file zlib
+FILE_DEPENDENCIES = host-file
 HOST_FILE_DEPENDENCIES = host-zlib
 FILE_CONF_ENV = ac_cv_prog_cc_c99='-std=gnu99'
 FILE_INSTALL_STAGING = YES
@@ -37,5 +37,12 @@ else
 FILE_CONF_OPTS += --disable-xzlib
 endif
 
+ifeq ($(BR2_PACKAGE_ZLIB),y)
+FILE_CONF_OPTS += --enable-zlib
+FILE_DEPENDENCIES += zlib
+else
+FILE_CONF_OPTS += --disable-zlib
+endif
+
 $(eval $(autotools-package))
 $(eval $(host-autotools-package))