libssh: add gcrypt to PACKAGECONFIG

This would allow to build it without libgcrypt (relying instead on
libcrypto).

Enable it by default to keep the recipe behaving the same wihtout a
configuration change.

Signed-off-by: Valentin Longchamp <valentin@longchamp.me>
Signed-off-by: Khem Raj <raj.khem@gmail.com>
(cherry picked from commit 86eb692a4e)
Signed-off-by: Armin Kuster <akuster808@gmail.com>

meta-oe/recipes-support/libssh/libssh_0.8.9.bb

@@ -4,7 +4,7 @@ SECTION = "libs"
 LICENSE = "LGPLv2.1"
 LIC_FILES_CHKSUM = "file://COPYING;md5=dabb4958b830e5df11d2b0ed8ea255a0"
 
-DEPENDS = "zlib openssl libgcrypt"
+DEPENDS = "zlib openssl"
 
 SRC_URI = "git://git.libssh.org/projects/libssh.git;branch=stable-0.8"
 SRCREV = "04685a74df9ce1db1bc116a83a0da78b4f4fa1f8"
@@ -13,13 +13,13 @@ S = "${WORKDIR}/git"
 
 inherit cmake
 
-PACKAGECONFIG ??=""
+PACKAGECONFIG ??= "gcrypt"
 PACKAGECONFIG[gssapi] = "-DWITH_GSSAPI=1, -DWITH_GSSAPI=0, krb5, "
+PACKAGECONFIG[gcrypt] = "-DWITH_GCRYPT=1, -DWITH_GCRYPT=0, libgcrypt, "
 
 ARM_INSTRUCTION_SET_armv5 = "arm"
 
 EXTRA_OECMAKE = " \
-    -DWITH_GCRYPT=1 \
     -DWITH_PCAP=1 \
     -DWITH_SFTP=1 \
     -DWITH_ZLIB=1 \