postproc: enable PIC on Solaris

Signed-off-by: Rafaël Carré <funman@videolan.org>
(cherry picked from commit d8ce467e626ae59cbea89456a52b88dc05802611)
Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>

contrib/src/postproc/rules.mak

@@ -75,6 +75,10 @@ else
 POSTPROCCONF += --enable-pthreads
 endif
 
+ifdef HAVE_SOLARIS
+POSTPROCCONF += --enable-pic
+endif
+
 # Build
 
 ifdef GPL