doxygen: Set EXAMPLE_PATH from within doxy-wrapper.sh

This allows using the libav source path as the example path.

doc/Doxyfile

@@ -639,8 +639,7 @@ EXCLUDE_SYMBOLS        =
 # directories that contain example code fragments that are included (see
 # the \include command).
 
-EXAMPLE_PATH           = libavcodec/ \
-                         libavformat/
+EXAMPLE_PATH           =
 
 # If the value of the EXAMPLE_PATH tag contains directories, you can use the
 # EXAMPLE_PATTERNS tag to specify one or more wildcard pattern (like *.cpp

doc/doxy-wrapper.sh

@@ -8,6 +8,7 @@ shift 2
 doxygen - <<EOF
 @INCLUDE        = ${DOXYFILE}
 INPUT           = $@
+EXAMPLE_PATH    = ${SRC_PATH}/
 HTML_HEADER     = ${SRC_PATH}/doc/doxy/header.html
 HTML_FOOTER     = ${SRC_PATH}/doc/doxy/footer.html
 HTML_STYLESHEET = ${SRC_PATH}/doc/doxy/doxy_stylesheet.css