tweak the preprocessor controls so that the *_API win DLL macros don't show up
diff --git a/doc/Doxyfile b/doc/Doxyfile
index b0f9a09..e862979 100644
--- a/doc/Doxyfile
+++ b/doc/Doxyfile
@@ -716,13 +716,13 @@
# compilation will be performed. Macro expansion can be done in a controlled
# way by setting EXPAND_ONLY_PREDEF to YES.
-MACRO_EXPANSION = NO
+MACRO_EXPANSION = YES
# If the EXPAND_ONLY_PREDEF and MACRO_EXPANSION tags are both set to YES
# then the macro expansion is limited to the macros specified with the
# PREDEFINED and EXPAND_AS_PREDEFINED tags.
-EXPAND_ONLY_PREDEF = NO
+EXPAND_ONLY_PREDEF = YES
# If the SEARCH_INCLUDES tag is set to YES (the default) the includes files
# in the INCLUDE_PATH (see below) will be search if a #include is found.
@@ -748,14 +748,14 @@
# or name=definition (no spaces). If the definition and the = are
# omitted =1 is assumed.
-PREDEFINED =
+PREDEFINED = unix
# If the MACRO_EXPANSION and EXPAND_PREDEF_ONLY tags are set to YES then
# this tag can be used to specify a list of macro names that should be expanded.
# The macro definition that is found in the sources will be used.
# Use the PREDEFINED tag if you want to use a different macro definition.
-EXPAND_AS_DEFINED =
+EXPAND_AS_DEFINED = FLAC_API
# If the SKIP_FUNCTION_MACROS tag is set to YES (the default) then
# doxygen's preprocessor will remove all function-like macros that are alone