Removed trailing spaces in the most relevant files

Command used for the job:
egrep -rl ' $' --include *.c --include *.h --include  *.s --include  *.inc --include  *.txt *  | xargs sed -i 's/\s\+$//g'

Credits to Grant Murphy from Stack Overflow.

sound/songs/se_m_heal_bell.s

@@ -30,10 +30,10 @@ se_m_heal_bell_1:
 	.byte		        c_v+11
 	.byte	W01
 	.byte		        c_v+1
-	.byte		N01   , An5 
+	.byte		N01   , An5
 	.byte	W01
 	.byte		MOD   , 7
-	.byte		N18   , Bn5 
+	.byte		N18   , Bn5
 	.byte	W02
 	.byte		PAN   , c_v+11
 	.byte	W01