[Cin] libtheora includes

[Andrew Randrianasulu]

I think I found small bug in configure.ac

https://git.cinelerra-gg.org/git/?p=goodguy/cinelerra.git;a=blob;f=cinelerra-5.1/configure.ac;h=f61ef275d78d548e7c8c3a222a4a984c75c34727;hb=HEAD

 301 PKG_3RD([libtheora],[auto],
 302   [libtheora-1.1.1],
 303   [ lib/.libs/libtheora.a \
 304     lib/.libs/libtheoradec.a \
 305     lib/.libs/libtheoraenc.a ],
 306   [ . ])

if last line indicate where includes located in module's tree ..

then for libtheora this location is 

thirdparty/libtheora-1.1.1/include/

so, *I think* last line should bre replaced with

[ include  ])

I fixed it locally in global_config ,  so it reads:

static_blds += libtheora
ver_libtheora := $(THIRDPARTY)/libtheora-1.1.1
inc_libtheora := \
  -I$(ver_libtheora)/include \

but this file generated by configure, right?

I think this can fix my error about building CinGG without libtheora installed 
(error was in ffmpeg, but if buildsystem consistently use  those parameters ..)