Include Flecs v3.2.11, remove submodule

.gitmodules

@@ -1,3 +0,0 @@
-[submodule "libs/flecs"]
-	path = libs/flecs
-	url = https://github.com/SanderMertens/flecs

build.zig.zon

@@ -2,15 +2,11 @@
     .name = "flecs-zig-ble",
     .version = "0.1.0",
     .paths = .{
+        "libs/flecs",
         "src",
         "build.zig",
         "build.zig.zon",
         "README.md",
         "UNLICENSE.txt",
-
-        // Flecs dependency.
-        "libs/flecs/flecs.c",
-        "libs/flecs/flecs.h",
-        "libs/flecs/LICENSE",
     },
 }

libs/flecs

@@ -1 +0,0 @@
-Subproject commit 198607d10ab8f8fc44540043271d6e3be019250b

libs/flecs/LICENSE

@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) 2019 Sander Mertens
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.