Use .gitmodules to handle OpenCL headers depency

Based on https://github.com/hashcat/hashcat/pull/467

.gitignore

@@ -7,7 +7,6 @@ hashcat
 *.pot
 *.log
 *.dSYM
-deps/**
 kernels/**
 lib/*.a
 obj/*.o

.travis.yml

@@ -3,8 +3,7 @@ os:
   - osx
 language: c
 install:
-  - mkdir -p deps/OpenCL-Headers
+  - git submodule update --recursive
-  - git clone https://github.com/KhronosGroup/OpenCL-Headers deps/OpenCL-Headers/CL
 compiler:
   - clang
   - gcc

BUILD.md

@@ -19,8 +19,7 @@ $ git clone https://github.com/hashcat/hashcat.git
 Get a copy of the **OpenCL Headers** repository
 
 ```sh
-$ mkdir -p deps/OpenCL-Headers
+$ git submodule update --recursive
-$ git clone https://github.com/KhronosGroup/OpenCL-Headers deps/OpenCL-Headers/CL
 ```
 
 Run "make"

docs/changes.txt

@@ -4,6 +4,7 @@
 ## Improvements
 ##
 
+- Use .gitmodules to handle OpenCL headers depency
 - Allow loading of bcrypt hashes with signature $2b$ (February 2014)
 
 ##