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_heat_wave.s

@@ -145,7 +145,7 @@ se_m_heat_wave_1:
 	.byte	W02
 	.byte		VOL   , 17*se_m_heat_wave_mvl/mxv
 	.byte	W03
-	.byte		EOT   
+	.byte		EOT
 	.byte	FINE
 
 @********************** Track  2 **********************@