build: doxy: Include code examples in Doxygen documentation

doc/Makefile

@@ -57,7 +57,7 @@ $(DOCS) doc/doxy/html: | doc/
 $(DOC_EXAMPLES:%$(EXESUF)=%.o): | doc/examples
 OBJDIRS += doc/examples
 
-DOXY_INPUT      = $(addprefix $(SRC_PATH)/, $(INSTHEADERS))
+DOXY_INPUT      = $(addprefix $(SRC_PATH)/, $(INSTHEADERS) $(DOC_EXAMPLES:%$(EXESUF)=%.c) $(LIB_EXAMPLES:%$(EXESUF)=%.c))
 DOXY_TEMPLATES  = doxy_stylesheet.css footer.html header.html
 DOXY_TEMPLATES := $(addprefix $(SRC_PATH)/doc/doxy/, $(DOXY_TEMPLATES))
 

library.mak

@@ -5,6 +5,7 @@ LIBMAJOR   := $(lib$(NAME)_VERSION_MAJOR)
 LIBMINOR   := $(lib$(NAME)_VERSION_MINOR)
 INCINSTDIR := $(INCDIR)/lib$(NAME)
 
+LIB_EXAMPLES := $(LIB_EXAMPLES) $(EXAMPLES)
 INSTHEADERS := $(INSTHEADERS) $(HEADERS:%=$(SUBDIR)%)
 
 all-$(CONFIG_STATIC): $(SUBDIR)$(LIBNAME)