Compiler warnings

[gagern]

Current cinelerra produces a number of compiler warnings, which the Gentoo build system considers QA issues, imho rightly so. I'll attach a patch to address them. The compiler warnings in question are:

ac3.c:24:2: warning: incompatible implicit declaration of built-in function 'free'
layer3.c:1549:2: warning: incompatible implicit declaration of built-in function 'free'
graphics.c:74:2: warning: incompatible implicit declaration of built-in function 'free'
mplex.c:186:26: warning: incompatible implicit declaration of built-in function ‘strlen’
mplex.c:187:4: warning: incompatible implicit declaration of built-in function ‘strcpy’
mpeg3title.c:194:5: warning: too few arguments for format
title.C:1385:66: warning: too few arguments for format

[gagern]

Fix issues the compiler refers to