textproc/wv: fix build with clang 15

During an exp-run for llvm 15 (see bug 265425), it turned out that
textproc/wv failed to build with clang 15:

  wvSummary.c:104:17: error: incompatible integer to pointer conversion initializing 'const GValue *' (aka 'const struct _GValue *') with an expression of type 'int' [-Wint-conversion]
    GValue const *val = gsf_doc_prop_get_val  (prop);
                  ^     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  wvSummary.c:146:21: error: incompatible integer to pointer conversion initializing 'GsfDocMetaData *' (aka 'struct _GsfDocMetaData *') with an expression of type 'int' [-Wint-conversion]
      GsfDocMetaData *meta_data = gsf_doc_meta_data_new ();
                      ^           ~~~~~~~~~~~~~~~~~~~~~~~~

Those functions are declared in <gsf/gsf-doc-meta-data.h>, but that
header is not included in wvSummary.c.

PR:		268399
Approved by:	portmgr (tcberner)
MFH:		2022Q4

textproc/wv/files/patch-wvSummary.c

@@ -0,0 +1,10 @@
+--- wvSummary.c.orig	2009-09-01 08:38:31 UTC
++++ wvSummary.c
+@@ -33,6 +33,7 @@
+ #include <gsf/gsf-msole-utils.h>
+ #include <gsf/gsf-docprop-vector.h>
+ #include <gsf/gsf-meta-names.h>
++#include <gsf/gsf-doc-meta-data.h>
+ 
+ #include <stdio.h>
+ #include <stdlib.h>