Add pthread external library to source...

and add instructions in physac examples to run it successful.

.gitignore

@@ -72,4 +72,5 @@ src/libraylib.bc
 # external libraries DLLs
 !src/external/glfw3/lib/win32/glfw3.dll
 !src/external/openal_soft/lib/win32/OpenAL32.dll
-!src/external/OculusSDK/LibOVR/LibOVRRT32_1.dll
+!src/external/OculusSDK/LibOVR/LibOVRRT32_1.dll
+!src/external/pthread/pthreadGC2.dll

examples/physics_basic_rigidbody.c

@@ -5,6 +5,10 @@
 *   This example has been created using raylib 1.5 (www.raylib.com)
 *   raylib is licensed under an unmodified zlib/libpng license (View raylib.h for details)
 *
+*
+*   Compile example using:
+*   cmd /c IF NOT EXIST pthreadGC2.dll copy C:\raylib\raylib\src\external\pthread\pthreadGC2.dll $(CURRENT_DIRECTORY) /Y
+*
 *   Copyright (c) 2016 Victor Fisac and Ramon Santamaria (@raysan5)
 *
 ********************************************************************************************/

examples/physics_forces.c

@@ -5,6 +5,11 @@
 *   This example has been created using raylib 1.5 (www.raylib.com)
 *   raylib is licensed under an unmodified zlib/libpng license (View raylib.h for details)
 *
+*   NOTE: This example requires raylib module [rlgl]
+*
+*   Compile example using:
+*   cmd /c IF NOT EXIST pthreadGC2.dll copy C:\raylib\raylib\src\external\pthread\pthreadGC2.dll $(CURRENT_DIRECTORY) /Y
+*
 *   Copyright (c) 2016 Victor Fisac and Ramon Santamaria (@raysan5)
 *
 ********************************************************************************************/