doc/doxygen: exclude file build/include/starpu_config (this is necessary when building directly from source directory)

doc/doxygen/doxygen-config.cfg.in

@@ -31,3 +31,5 @@ EXAMPLE_PATH           = @top_srcdir@/doc/doxygen \
 INPUT_FILTER           = @top_builddir@/doc/doxygen/doxygen_filter.sh
 
 LATEX_HEADER           = @top_srcdir@/doc/doxygen/refman.tex
+
+EXCLUDE_PATTERNS       = @abs_top_builddir@/include/starpu_config.h

doc/doxygen/doxygen.cfg

@@ -739,7 +739,8 @@ EXCLUDE_SYMLINKS       = NO
 # against the file with absolute path, so to exclude all test directories
 # for example use the pattern */test/*
 
-EXCLUDE_PATTERNS       =
+#defined in doxygen-config.cfg
+#EXCLUDE_PATTERNS       =
 
 # The EXCLUDE_SYMBOLS tag can be used to specify one or more symbol names
 # (namespaces, classes, functions, etc.) that should be excluded from the