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heretic: Move screenblocks extern declaration to r_local.h

--- a/src/heretic/d_main.c

+++ b/src/heretic/d_main.c

@@ -651,7 +651,6 @@

 void D_BindVariables(void)

 {

-    extern int screenblocks;

     int i;

     M_ApplyPlatformDefaults();

--- a/src/heretic/mn_menu.c

+++ b/src/heretic/mn_menu.c

@@ -120,7 +120,6 @@

 // External Data

 extern int detailLevel;

-extern int screenblocks;

 // Public Data

--- a/src/heretic/r_local.h

+++ b/src/heretic/r_local.h

@@ -294,6 +294,8 @@

 extern int detailshift;         // 0 = high, 1 = low

+extern int screenblocks;

+

 extern void (*colfunc) (void);

 extern void (*basecolfunc) (void);

 extern void (*tlcolfunc) (void);