[build] add missing file for test_burl

add missing file for test_burl for cmake and meson builds

src/CMakeLists.txt

@@ -654,6 +654,7 @@ add_executable(test_burl
 	t/test_burl.c
 	burl.c
 	buffer.c
+	base64.c
 )
 add_test(NAME test_burl COMMAND test_burl)
 

src/meson.build

@@ -694,7 +694,7 @@ test('test_buffer', executable('test_buffer',
 ))
 
 test('test_burl', executable('test_burl',
-	sources: ['t/test_burl.c', 'burl.c', 'buffer.c'],
+	sources: ['t/test_burl.c', 'burl.c', 'buffer.c', 'base64.c'],
 	dependencies: common_flags + libunwind,
 	build_by_default: false,
 ))