Fix a few harmless uninitialized variables

Origin: https://build.opensuse.org/package/view_file/openSUSE:Factory/w3m/w3m-uninitialized.patch?expand=1

anchor.c

@@ -11,7 +11,7 @@ putAnchor(AnchorList *al, char *url, char *target, Anchor **anchor_return,
 {
     int n, i, j;
     Anchor *a;
-    BufferPoint bp;
+    BufferPoint bp = { 0 };
     if (al == NULL) {
 	al = New(AnchorList);
 	al->anchors = NULL;

libwc/gb18030.c

@@ -151,6 +151,7 @@ wc_ucs_to_gb18030(wc_uint32 ucs)
 	return cc;
     }
     cc.ccs = WC_CCS_UNKNOWN;
+    cc.code = 0;
     return cc;
 }
 #endif

libwc/ucs.c

@@ -100,6 +100,7 @@ wc_ucs_to_any(wc_uint32 ucs, wc_table *t)
 	    return t->conv(t->ccs, map->code2);
     }
     cc.ccs = WC_CCS_UNKNOWN;
+    cc.code = 0;
     return cc;
 }
 

regex.c

@@ -77,7 +77,7 @@ static longchar
 set_longchar(char *str)
 {
     unsigned char *p = (unsigned char *)str;
-    longchar r;
+    longchar r = { };
 
 #ifdef USE_M17N
     if (*p & 0x80) {