FALLBACK_CONFIG_DIR did not work. Fixed.

- Flag was ignored. Now it's taken into account.
- Missing trailing slashes in path now behaves properly.

CMakeLists.txt

@@ -2,7 +2,8 @@ cmake_minimum_required(VERSION 3.1.0)
 
 project(sway C)
 
-set(FALLBACK_CONFIG_DIR "/etc/sway/")
+set(FALLBACK_CONFIG_DIR "/etc/sway" CACHE PATH
+  "Fallback config directory defaults to /etc/sway")
 add_definitions('-DFALLBACK_CONFIG_DIR=\"${FALLBACK_CONFIG_DIR}\"')
 
 set(CMAKE_C_FLAGS "-g")

sway/config.c

@@ -136,7 +136,7 @@ static char *get_config_path(void) {
 		"$XDG_CONFIG_HOME/sway/config",
 		"$HOME/.i3/config",
 		"$XDG_CONFIG_HOME/i3/config",
-                FALLBACK_CONFIG_DIR "config",
+                FALLBACK_CONFIG_DIR "/config",
 		"/etc/i3/config",
 	};