Update to libc 0.2, remove unnecessary gl_common crate

Cargo.toml

@@ -13,11 +13,11 @@ build = "build.rs"
 [dependencies]
 gl_common = "0.1.0"
 lazy_static = "0.1.10"
-libc = "0.1"
+libc = "0.2"
 shared_library = "0.1.0"
 
 [build-dependencies]
-gl_generator = "0.1.0"
+gl_generator = "0.2.0"
 khronos_api = "0.0.8"
 
 [dev-dependencies]
@@ -27,22 +27,22 @@ clock_ticks = "0.1.0"
 version = "0.1"
 
 [target.i386-apple-ios.dependencies]
-objc = ">=0.1.0, <=0.1.7"
+objc = "0.1.8"
 
 [target.x86_64-apple-ios.dependencies]
-objc = ">=0.1.0, <=0.1.7"
+objc = "0.1.8"
 
 [target.aarch64-apple-ios.dependencies]
-objc = ">=0.1.0, <=0.1.7"
+objc = "0.1.8"
 
 [target.armv7s-apple-ios.dependencies]
-objc = ">=0.1.0, <=0.1.7"
+objc = "0.1.8"
 
 [target.armv7-apple-ios.dependencies]
-objc = ">=0.1.0, <=0.1.7"
+objc = "0.1.8"
 
 [target.x86_64-apple-darwin.dependencies]
-objc = ">=0.1.0, <=0.1.7"
+objc = "0.1.8"
 cgl = "0.1"
 cocoa = "0.1.4"
 core-foundation = "0"
@@ -53,31 +53,31 @@ winapi = "0.2"
 shell32-sys = "0.1"
 gdi32-sys = "0.1"
 user32-sys = "~0.1.2"
-kernel32-sys = "0.1"
+kernel32-sys = "0.2"
 dwmapi-sys = "0.1"
 
 [target.i686-pc-windows-msvc.dependencies]
 winapi = "0.2"
 shell32-sys = "0.1"
 gdi32-sys = "0.1"
 user32-sys = "~0.1.2"
-kernel32-sys = "0.1"
+kernel32-sys = "0.2"
 dwmapi-sys = "0.1"
 
 [target.x86_64-pc-windows-gnu.dependencies]
 winapi = "0.2"
 shell32-sys = "0.1"
 gdi32-sys = "0.1"
 user32-sys = "~0.1.2"
-kernel32-sys = "0.1"
+kernel32-sys = "0.2"
 dwmapi-sys = "0.1"
 
 [target.x86_64-pc-windows-msvc.dependencies]
 winapi = "0.2"
 shell32-sys = "0.1"
 gdi32-sys = "0.1"
 user32-sys = "~0.1.2"
-kernel32-sys = "0.1"
+kernel32-sys = "0.2"
 dwmapi-sys = "0.1"
 
 [target.i686-unknown-linux-gnu.dependencies]

src/lib.rs

@@ -29,7 +29,6 @@ extern crate lazy_static;
 #[macro_use]
 extern crate shared_library;
 
-extern crate gl_common;
 extern crate libc;
 
 #[cfg(target_os = "windows")]