Use autotools to build (#27)

* remove c3d/build

* autotools start

* ignore

* autoreconf? idk

* linux/osx gcc/clang

* no glut, need glew tho

* fix test matrix

* fix linux conditional includes?

* sdl makefile am

* SDL2 m4/autoconf

* idk more m4 crap

* ignore more junk

* ug

* go away idk

* renderer makefile

* fixing SDL's broken-ass sdl2.m4 lol

* progress

* cmake go away

* full autotools build working yay

* autogen script, readme update

* fix linux ifdefs

* stuff

* fix linux -ldl

* mac sdl dep for travis

* whoops

* brewwww

* no osx gcc

* no test

* kinda working linux library build

* travis apt packages

* ignore old SDL2 for travis

* typo

* autogen for osx build readme

src/libprojectM/PresetLoader.cpp

@@ -16,7 +16,7 @@
 #include <sstream>
 #include <set>
 
-#ifdef LINUX
+#ifdef __linux__
 extern "C"
 {
 #include <errno.h>