crda: use gcrypt as default crypt

As Makefile told us, if `USE_OPENSSL=1', only openssl10 works,
even though the recipe depends libgcrypt.
[Makefile snip]
|ifeq ($(USE_OPENSSL),1)
|CFLAGS += -DUSE_OPENSSL
[snip]
|else
|CFLAGS += -DUSE_GCRYPT
[Makefile snip]

The crda dpends openssl 1.0.x which there is a build failure with
openssl 1.1.x. So use gcrypt instead of openssl by default.

The idea refers:
https://bugs.chromium.org/p/chromium/issues/detail?id=735782
https://gitweb.gentoo.org/repo/gentoo.git/tree/net-wireless/crda/crda-3.18-r1.ebuild#n36

Signed-off-by: Hongxu Jia <hongxu.jia@windriver.com>
Signed-off-by: Khem Raj <raj.khem@gmail.com>

meta-networking/recipes-connectivity/crda/crda_3.18.bb

@@ -4,8 +4,10 @@ SECTION = "net"
 LICENSE = "copyleft-next-0.3.0"
 LIC_FILES_CHKSUM = "file://copyleft-next-0.3.0;md5=8743a2c359037d4d329a31e79eabeffe"
 
-DEPENDS = "python-m2crypto-native python-typing-native python-native \
-           libgcrypt libnl openssl10"
+DEPENDS = "python-m2crypto-native python-typing-native python-native libnl \
+           ${@oe.utils.conditional("DEFAULT_CRYPT", "gcrypt", "libgcrypt", "", d)} \
+           ${@oe.utils.conditional("DEFAULT_CRYPT", "openssl", "openssl10", "", d)} \
+          "
 
 SRC_URI = "https://www.kernel.org/pub/software/network/${BPN}/${BP}.tar.xz \
            file://do-not-run-ldconfig-if-destdir-is-set.patch \
@@ -21,9 +23,12 @@ SRC_URI[sha256sum] = "43fcb9679f8b75ed87ad10944a506292def13e4afb194afa7aa921b01e
 
 inherit python-dir pythonnative siteinfo
 
+# "gcrypt" or "openssl"
+DEFAULT_CRYPT ??= "gcrypt"
+
 # Recursive make problem
 EXTRA_OEMAKE = "MAKEFLAGS= DESTDIR=${D} LIBDIR=${libdir}/crda LDLIBREG='-Wl,-rpath,${libdir}/crda -lreg'"
-EXTRA_OEMAKE_append = " USE_OPENSSL=1"
+EXTRA_OEMAKE_append = " ${@oe.utils.conditional("DEFAULT_CRYPT", "openssl", "USE_OPENSSL=1", "", d)}"
 TARGET_BITS = "${SITEINFO_BITS}"
 export TARGET_BITS