Make ruamoko docs build properly in out-of-tree builds.

ruamoko/Doxyfile.in

@@ -114,7 +114,7 @@ FULL_PATH_NAMES        = YES
 # If left blank the directory from which doxygen is run is used as the
 # path to strip.
 
-STRIP_FROM_PATH        = .
+STRIP_FROM_PATH        = @TOPSRC@/ruamoko
 
 # The STRIP_FROM_INC_PATH tag can be used to strip a user-defined part of
 # the path mentioned in the documentation of a class, which tells
@@ -123,7 +123,7 @@ STRIP_FROM_PATH        = .
 # definition is used. Otherwise one should specify the include paths that
 # are normally passed to the compiler using the -I flag.
 
-STRIP_FROM_INC_PATH    = include/
+STRIP_FROM_INC_PATH    = @TOPSRC@/ruamoko/include/
 
 # If the SHORT_NAMES tag is set to YES, doxygen will generate much shorter
 # (but less readable) file names. This can be useful is your file systems
@@ -582,11 +582,11 @@ WARN_LOGFILE           =
 # directories like "/usr/src/myproject". Separate the files or directories
 # with spaces.
 
-INPUT                  = include/
-INPUT                 += lib/
-INPUT                 += game/
-INPUT                 += gui/
-INPUT                 += cl_menu/
+INPUT                  = @TOPSRC@/ruamoko/include/
+INPUT                 += @TOPSRC@/ruamoko/lib/
+INPUT                 += @TOPSRC@/ruamoko/game/
+INPUT                 += @TOPSRC@/ruamoko/gui/
+INPUT                 += @TOPSRC@/ruamoko/cl_menu/
 
 # This tag can be used to specify the character encoding of the source files
 # that doxygen parses. Internally doxygen uses the UTF-8 encoding, which is
@@ -643,7 +643,7 @@ EXCLUDE_SYMBOLS        =
 # directories that contain example code fragments that are included (see
 # the \include command).
 
-EXAMPLE_PATH           = examples
+EXAMPLE_PATH           = @TOPSRC@/ruamoko/examples
 
 # 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
@@ -1222,7 +1222,7 @@ SEARCH_INCLUDES        = YES
 # contain include files that are not input files but should be processed by
 # the preprocessor.
 
-INCLUDE_PATH           = @TOPSRC@/include
+INCLUDE_PATH           = @TOPSRC@/ruamoko/include
 
 # You can use the INCLUDE_FILE_PATTERNS tag to specify one or more wildcard
 # patterns (like *.h and *.hpp) to filter out the header-files in the