Don't use min/max as function names

They can be macros on some systems.  Eg. mingw32.

src/hb-set-private.hh

@@ -102,7 +102,7 @@ struct _hb_set_t
     for (unsigned int i = 0; i < ELTS; i++)
       elts[i] &= ~other->elts[i];
   }
-  inline hb_codepoint_t min (void) const
+  inline hb_codepoint_t get_min (void) const
   {
     for (unsigned int i = 0; i < ELTS; i++)
       if (elts[i])
@@ -111,7 +111,7 @@ struct _hb_set_t
 	    return i * BITS + j;
     return 0;
   }
-  inline hb_codepoint_t max (void) const
+  inline hb_codepoint_t get_max (void) const
   {
     for (unsigned int i = ELTS; i; i--)
       if (elts[i - 1])

src/hb-set.cc

@@ -167,11 +167,11 @@ hb_set_subtract (hb_set_t *set,
 hb_codepoint_t
 hb_set_min (hb_set_t *set)
 {
-  return set->min ();
+  return set->get_min ();
 }
 
 hb_codepoint_t
 hb_set_max (hb_set_t *set)
 {
-  return set->max ();
+  return set->get_max ();
 }