Build explicit version of Jansson in build scripts

As the Avro C API depends on the Jansson library, the build scripts must
build it. This is not optimal as the Jansson version needs to be updated
in two places.

BUILD/install_build_deps.sh

@@ -109,6 +109,24 @@ cd tcl8.6.5/unix
 sudo make install
 cd ../../..
 
+
+# Jansson
+git clone https://github.com/akheron/jansson.git
+if [ $? != 0 ]
+then
+    echo "Error cloning jansson"
+    exit 1
+fi
+
+cd jansson
+git checkout v2.9
+mkdir build
+cd build
+cmake .. -DCMAKE_INSTALL_PREFIX=/usr -DCMAKE_C_FLAGS=-fPIC -DJANSSON_INSTALL_LIB_DIR=$install_libdir
+make
+sudo make install
+cd ../../
+
 # Avro C API
 wget -r -l1 -nH --cut-dirs=2 --no-parent -A.tar.gz --no-directories http://mirror.netinch.com/pub/apache/avro/stable/c
 if [ $? != 0 ]