Remove bogus extern declaration for "encoding"

git-svn-id: https://svn.osgeo.org/grass/grass/trunk@34932 15284696-431f-4ddb-bdfa-cd5b030d7da7

lib/driver/driver.h

@@ -18,7 +18,6 @@ extern double text_cosrot;
 extern int matrix_valid;
 
 extern struct GFONT_CAP *ftcap;
-extern char *encoding;
 
 struct driver
 {