When searching for a string buffer, use the key as a substring.

The dfincremental ui does not allow entering strings with trailing
whitespace, and anyway sometimes it is difficult to guess how a GUI
string actually ends. Therefore it is probably more generic to
search for buffers that simply begin with the entered string.

tools/supported/SegmentedFinder.h

@@ -529,7 +529,7 @@ bool findString (SegmentedFinder* s, uint32_t *addr, const char * compare )
 
 bool findStrBuffer (SegmentedFinder* s, uint32_t *addr, const char * compare )
 {
-    if(strcmp((const char *)addr, compare) == 0)
+    if(memcmp((const char *)addr, compare, strlen(compare)) == 0)
         return true;
     return false;
 }