flats: buildcfg: remove many duplicate entries (Sodaholic)

This was a lot easier to do without having to worry about shareware!

Thanks to Sodaholic for reporting:
http://www.doomworld.com/vb/post/952575

Signed-off-by: RjY <rjy@users.sourceforge.net>

buildcfg.txt

@@ -2769,13 +2769,9 @@ CEIL3_4
 CEIL3_5 
 CEIL3_6
 CEIL4_3
-CEIL4_3 
 CEIL5_1
-CEIL5_1 
 CEIL5_2
-CEIL5_2 
 DEM1_3
-DEM1_3 
 DEM1_5
 DEM1_6
 FLAT17
@@ -2783,7 +2779,6 @@ FLAT1_1
 FLAT1_2
 FLAT1_3
 FLAT22
-FLAT22  
 FLAT5_1
 FLAT5_2
 FLAT5_6
@@ -2842,20 +2837,13 @@ SLIME13
 SLIME14
 SLIME15
 SLIME16
-CEIL3_1 
-CEIL3_2 
-CEIL3_5 
 CEIL4_2
-CEIL4_3 
-CEIL5_1 
-CEIL5_2 
 CONS1_1
 CONS1_5
 CONS1_7
 CONS1_9			; this is missing in the original wad
 DEM1_1
 DEM1_2
-DEM1_3 
 DEM1_4
 FLAT1
 FLAT10
@@ -2863,7 +2851,6 @@ FLAT14
 FLAT18
 FLAT2
 FLAT20
-FLAT22  
 FLAT23
 FLAT5
 FLAT5_4
@@ -2919,18 +2906,4 @@ CRATOP1
 CRATOP2
 FLAT19
 MFLR8_2
-FLAT17
-FLAT5_1
-BLOOD1
-BLOOD2
-BLOOD3
-RROCK12
-FLOOR0_2
-FLOOR1_6
-DEM1_6
-SLIME14
-SLIME16
-GRASS1
-SLIME13
-RROCK03