package/rauc: needs libopenssl, not libressl

Fixes http://autobuild.buildroot.net/results/6efc1275d3aac9f0a4c000f3d0911b5a880e495d/

Rauc uses X509_PURPOSE_get_by_id() since rauc-1.3 with commit 375dbb16dd94
("src/signature: add support for codesigning certificate purpose"):

../src/signature.c: In function 'signature_init':
../src/signature.c:97:13: warning: implicit declaration of function 'X509_PURPOSE_get_by_id'; did you mean 'X509_PURPOSE_get_id'? [-Wimplicit-function-declaration]
   97 |         if (X509_PURPOSE_get_by_id(id) >= 0) {

Which is not provided by LibreSSL:

nm -D target/usr/lib/libcrypto.so | grep X509_PURPOSE_
00000000001377b0 T X509_PURPOSE_get0
0000000000137850 T X509_PURPOSE_get0_name
0000000000137860 T X509_PURPOSE_get0_sname
00000000001377d0 T X509_PURPOSE_get_by_sname
00000000001377a0 T X509_PURPOSE_get_count
0000000000137840 T X509_PURPOSE_get_id

So force the use of libopenssl.

Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
(cherry picked from commit 9679ddbcd066d562ffc8b8d46a571fd99fe7f275)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/rauc/Config.in

@@ -5,8 +5,9 @@ config BR2_PACKAGE_RAUC
 	depends on BR2_USE_WCHAR # glib2
 	select BR2_PACKAGE_LIBGLIB2
 	select BR2_PACKAGE_OPENSSL
+	select BR2_PACKAGE_OPENSSL_FORCE_LIBOPENSSL # uses X509_PURPOSE_get_by_id
 	# uses ENGINE_* API
-	select BR2_PACKAGE_LIBOPENSSL_ENGINES if BR2_PACKAGE_LIBOPENSSL
+	select BR2_PACKAGE_LIBOPENSSL_ENGINES
 	select BR2_PACKAGE_SQUASHFS # run-time dependency
 	select BR2_PACKAGE_UBOOT_TOOLS if BR2_TARGET_UBOOT # run-time dependency
 	select BR2_PACKAGE_UBOOT_TOOLS_FWPRINTENV if BR2_TARGET_UBOOT