inspector: Add new <class> field to output of virt-inspector

Fixes: https://issues.redhat.com/browse/RHEL-125955

Author: rwmjones

inspector/inspector.c

@@ -697,6 +697,8 @@ output_applications (xmlTextWriterPtr xo, char *root)
           single_element ("summary", apps->val[i].app2_summary);
         if (apps->val[i].app2_description && apps->val[i].app2_description[0])
           single_element ("description", apps->val[i].app2_description);
+        if (apps->val[i].app2_class && apps->val[i].app2_class[0])
+          single_element ("class", apps->val[i].app2_class);
       } end_element ();
     }
   } end_element ();

inspector/virt-inspector.rng

@@ -212,6 +212,7 @@
           <optional><element name="source_package"><text/></element></optional>
           <optional><element name="summary"><text/></element></optional>
           <optional><element name="description"><text/></element></optional>
+          <optional><element name="class"><text/></element></optional>
         </element>
       </zeroOrMore>
     </element>

m4/guestfs-libraries.m4

@@ -20,7 +20,8 @@ dnl Any C libraries required by the libguestfs C library (not the daemon).
 dnl Of course we need libguestfs.
 dnl
 dnl We need libguestfs 1.57.1 for guestfs_setfiles.
-PKG_CHECK_MODULES([LIBGUESTFS], [libguestfs >= 1.57.1])
+dnl We need libguestfs 1.57.6 for guestfs_inspect_get_applications2 app2_class.
+PKG_CHECK_MODULES([LIBGUESTFS], [libguestfs >= 1.57.6])
 printf "libguestfs version is "; $PKG_CONFIG --modversion libguestfs
 
 dnl Test if it's GNU or XSI strerror_r.