Add jansson to version hash table

Author: d-torrance

M2/Macaulay2/d/version.dd

@@ -71,6 +71,8 @@ header "
    #endif
 
    #include <libxml/xmlversion.h>
+
+   #include <jansson.h>
    ";
 
 header "
@@ -190,6 +192,7 @@ setupconst("version", Expr(toHashTable(Sequence(
    "ntl version" => Ccode(constcharstar,"NTL_VERSION"),
    "frobby version" => Ccode(constcharstar,"frobby_version"),
    "flint version" => Ccode(constcharstar,"FLINT_VERSION"),
+   "jansson version" => Ccode(constcharstar, "JANSSON_VERSION"),
    "scscp version" => Ccode(constcharstar,"
 	 #ifdef HAVE_SCSCP
 	   stringize(SCSCP_VERSION_MAJOR) \".\" stringize(SCSCP_VERSION_MINOR) \".\" stringize(SCSCP_VERSION_PATCH)