contrib: update jsoncpp

Gitlab: #1122
Change-Id: Ia80eb6f1b90c663419a6cbe25f416afee742e3c3

contrib/src/jsoncpp/SHA512SUMS

-32702147229ea7a3679654325572c38f4188f258ab6ac21f9e04059d53ef2a7cd0542ec4ec3b0e7b9089acd2b7bce389f16b9ff24b2e63e0ba2a5bcd46bab766  jsoncpp-1.7.2.tar.gz
-f1c035d54ed952d8d4e41acab5c3ecf6aa445f348f98aeac2e7c89555ec2f6421d727b3bc4c2f54176afce137c545b20d886562901953ec091f91890e91e8559  jsoncpp-1.9.3.tar.gz
\ No newline at end of file
+006d81f9f723dcfe875ebc2147449c07c5246bf97dd7b9eee1909decc914b051d6f3f06feb5c3dfa143d28773fb310aabb04a81dc447cc61513309df8eba8b08  jsoncpp-1.9.6.tar.gz
\ No newline at end of file

contrib/src/jsoncpp/rules.mak

 # JSONCPP
-JSONCPP_VERSION := 1.9.3
+JSONCPP_VERSION := 1.9.6
 PKG_CPE += cpe:2.3:a:jsoncpp_project:jsoncpp:$(JSONCPP_VERSION):*:*:*:*:*:*:*
 
 JSONCPP_URL := https://github.com/open-source-parsers/jsoncpp/archive/$(JSONCPP_VERSION).tar.gz
@@ -24,6 +24,7 @@ jsoncpp: jsoncpp-$(JSONCPP_VERSION).tar.gz .sum-jsoncpp
 	$(MOVE)
 
 .jsoncpp: jsoncpp toolchain.cmake
-	cd $< && $(HOSTVARS) $(CMAKE) ${JSONCPP_CMAKECONF}
-	cd $< && $(MAKE) install
+	cd $< && mkdir -p build
+	cd $< && cd build && $(HOSTVARS) $(CMAKE) .. ${JSONCPP_CMAKECONF}
+	cd $< && cd build && $(MAKE) install
 	touch $@