platform.h: created to allow for much better platform detection

platform.h is a tool I made to allow for effortless detection of the
compiler, OS, and architecture that the app is being compiled for.

- To check the operating system, you can check whether these macros are
  defined:

    TARGET_OS_WINDOWS
    TARGET_OS_MACOSX
    TARGET_OS_LINUX
	TARGET_OS_SOLARIS // OpenSolaris, Solaris, etc
    TARGET_OS_FREEBSD
    TARGET_OS_OPENBSD
    TARGET_OS_NETBSD
    TARGET_OS_DOS
    TARGET_OS_NDSFIRMWARE // NDS == Nintendo DS

- To check whether the platform is 32 or 64-bit:

    TARGET_CPU_BITS == 32
    TARGET_CPU_BITS == 64

- To check your platform's endianness (byte ordering), check whether
  these are defined:

    TARGET_LITTLE_ENDIAN // x86, x86_64, Alpha, IA64, ARM
    TARGET_BIG_ENDIAN    // PowerPC, SPARC

- To check for a compiler, you can check whether these macros are
  defined:

    TARGET_COMPILER_MSVC // Visual C++
    TARGET_COMPILER_ICC  // Intel C/C++ compiler
    TARGET_COMPILER_GCC  // GCC
     Note that there are some subsets of GCC that you may want
     to check for (these macros will be defined *in addition*
     to the TARGET_COMPILER_GCC macro:
       TARGET_COMPILER_CYGWIN
       TARGET_COMPILER_MINGW
       TARGET_COMPILER_DJGPP  // DOS port
    TARGET_COMPILER_BORLAND

Signed-off-by: Steven Noonan <steven@uplinklabs.net>

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