openpower-build-setup: Add openssl dependency

The kernel is now build with module signing which requires openssl.

Change-Id: I7edd15a699a16acdde5baf5620af0ea4e6e0474b
Signed-off-by: Joel Stanley <joel@jms.id.au>
diff --git a/openpower-build-setup.sh b/openpower-build-setup.sh
index fa79635..04c8cd6 100755
--- a/openpower-build-setup.sh
+++ b/openpower-build-setup.sh
@@ -61,6 +61,7 @@
 	git \
 	libxml2-devel \
 	ncurses-devel \
+	openssl-devel \
 	patch \
 	perl \
 	perl-bignum \
@@ -107,6 +108,7 @@
 	flex \
 	g++ \
 	git \
+	libssl-dev \
 	libexpat-dev \
 	libz-dev \
 	libxml-sax-perl \