Avoid building OpenSSL docs

Author: afh

Makefile

@@ -410,7 +410,7 @@ $$(OPENSSL_SRCDIR-$(target))/libssl.a: $$(OPENSSL_SRCDIR-$(target))/is_configure
 		CC="$$(CC-$(target)) $$(CFLAGS-$(target))" \
 		CROSS_TOP="$$(dir $$(SDK_ROOT-$(target))).." \
 		CROSS_SDK="$$(notdir $$(SDK_ROOT-$(target)))" \
-		make all \
+		make build_sw \
 			2>&1 | tee -a ../openssl-$(OPENSSL_VERSION).build.log
 
 $$(OPENSSL_SSL_LIB-$(target)): $$(OPENSSL_SRCDIR-$(target))/libssl.a