move cell_simple_p() for debug builds

src/lib/egcpool.h

@@ -253,6 +253,12 @@ cell_egc_idx(const cell* c){
   return c->gcluster & 0x00fffffflu;
 }
 
+// Is the cell simple (a UTF8-encoded EGC of four bytes or fewer)?
+static inline bool
+cell_simple_p(const cell* c){
+  return (c->gcluster >> 24u) != 0x01;
+}
+
 // only applies to complex cells, do not use on simple cells
 __attribute__ ((__returns_nonnull__)) static inline const char*
 egcpool_extended_gcluster(const egcpool* pool, const cell* c) {

src/lib/internal.h

@@ -318,12 +318,6 @@ void init_lang(struct notcurses* nc); // nc may be NULL, only used for logging
 int terminfostr(char** gseq, const char* name);
 int interrogate_terminfo(tinfo* ti);
 
-// Is the cell simple (a UTF8-encoded EGC of four bytes or fewer)?
-static inline bool
-cell_simple_p(const cell* c){
-  return (c->gcluster >> 24u) != 0x01;
-}
-
 // Search the provided multibyte (UTF8) string 's' for the provided unicode
 // codepoint 'cp'. If found, return the column offset of the EGC in which the
 // codepoint appears in 'col', and the byte offset as the return value. If not