db/update/ExcludeList: make no-op if GLib is disabled

Quick hack to allow using the database without GLib (for Android).

src/db/update/ExcludeList.cxx

@@ -39,6 +39,7 @@ static constexpr Domain exclude_list_domain("exclude_list");
 bool
 ExcludeList::LoadFile(Path path_fs)
 {
+#ifdef HAVE_GLIB
 	FILE *file = FOpen(path_fs, FOpenMode::ReadText);
 	if (file == nullptr) {
 		const int e = errno;
@@ -64,6 +65,10 @@ ExcludeList::LoadFile(Path path_fs)
 	}
 
 	fclose(file);
+#else
+	// TODO: implement
+	(void)path_fs;
+#endif
 
 	return true;
 }
@@ -75,9 +80,14 @@ ExcludeList::Check(Path name_fs) const
 
 	/* XXX include full path name in check */
 
+#ifdef HAVE_GLIB
 	for (const auto &i : patterns)
 		if (i.Check(name_fs.c_str()))
 			return true;
+#else
+	// TODO: implement
+	(void)name_fs;
+#endif
 
 	return false;
 }

src/db/update/ExcludeList.hxx

@@ -25,15 +25,19 @@
 #ifndef MPD_EXCLUDE_H
 #define MPD_EXCLUDE_H
 
+#include "check.h"
 #include "Compiler.h"
 
 #include <forward_list>
 
+#ifdef HAVE_GLIB
 #include <glib.h>
+#endif
 
 class Path;
 
 class ExcludeList {
+#ifdef HAVE_GLIB
 	class Pattern {
 		GPatternSpec *pattern;
 
@@ -57,11 +61,19 @@ class ExcludeList {
 	};
 
 	std::forward_list<Pattern> patterns;
+#else
+	// TODO: implement
+#endif
 
 public:
 	gcc_pure
 	bool IsEmpty() const {
+#ifdef HAVE_GLIB
 		return patterns.empty();
+#else
+		// TODO: implement
+		return true;
+#endif
 	}
 
 	/**