add deprecated nctablet_ncplane() for old binaries

include/notcurses/notcurses.h

@@ -1020,7 +1020,8 @@ API struct ncplane* ncplane_create(struct ncplane* n, const ncplane_options* nop
 
 // This function will be marked deprecated in 2.0 in favor of ncplane_create().
 // It persists only for backwards compatibility.
-API struct ncplane* ncplane_new(struct ncplane* n, int rows, int cols, int y, int x, void* opaque, const char* name);
+API struct ncplane* ncplane_new(struct ncplane* n, int rows, int cols, int y, int x, void* opaque, const char* name)
+  __attribute__ ((deprecated));
 
 // Suitable for use as a `resizecb`. This will realign the plane 'n' against its
 // parent, using the alignment specified at ncplane_create()-time.
@@ -2528,6 +2529,10 @@ API void* nctablet_userptr(struct nctablet* t);
 // Access the ncplane associated with nctablet 't', if one exists.
 API struct ncplane* nctablet_plane(struct nctablet* t);
 
+// Deprecated form of nctablet_plane().
+API struct ncplane* nctablet_ncplane(struct nctablet* t)
+  __attribute__ ((deprecated));
+
 // The number of columns is one fewer, as the STRLEN expressions must leave
 // an extra byte open in case 'µ' (U+00B5, 0xC2 0xB5) shows up. PREFIXCOLUMNS
 // is the maximum number of columns used by a mult == 1000 (standard)

src/lib/reel.c

@@ -715,6 +715,10 @@ ncplane* nctablet_plane(nctablet* t){
   return t->cbp;
 }
 
+ncplane* nctablet_ncplane(nctablet* t){ // deprecated
+  return nctablet_plane(t);
+}
+
 ncplane* ncreel_plane(ncreel* nr){
   return nr->p;
 }