Normal vs. Standalone FreeBASIC

When built from source, FreeBASIC can be configured for and installed in 
one of these two different setups:

Normal build (default)
Standalone build
Normal directory layout:
	* bin/
		* fbc.exe
		* [<target>-]ld.exe
		* other tools for native/cross compilation...
	* include/
		* freebasic/
			* fbgfx.bi
			* other headers...
	* lib/
		* freebasic/
			* <target>/
				* libfb.a
				* other libraries...
Standalone directory layout:
	* bin/
		* <target>/
			* ld.exe
			* other tools...
	* inc/
		* fbgfx.bi
		* other headers...
	* lib/
		* <target>/
			* libfb.a
			* other libraries...
	* fbc.exe
Differences to the standalone build:

	* fbc is located in bin/, like other programs
	* looks for includes in include/freebasic/, instead of inc/, to cleanly 
	  separate FB headers from system headers
	* looks for its own libraries in lib/freebasic/ instead of lib/, to 
	  cleanly separate FB libraries from system libraries
	* looks for binutils/gcc 1) in bin/ and 2) by relying on PATH
	* looks for crt/gcc libraries 1) in lib/freebasic/ and 2) by running "
	  gcc -print-file-name=..."
	* CompilerOpttarget-target option accepts system triplets such as "i686-pc-linux-gnu" or 
	  "x86_64-w64-mingw32"
	* the target name given to the CompilerOpttarget-target option is prepended to the 
	  gcc/binutils program names when cross-compiling
	* compatible with the standard /usr or /usr/local directories
	* typically used for the FB-linux release
	* uses windres from binutils to compile win32 resource scripts

This makes the normal FB build integrate with GNU/Linux distributions and 
other Unix-like systems pretty well, allows fbc to be installed into MinGW 
or DJGPP trees next to gcc, and allows fbc to work with binutils/gcc 
cross-compiling toolchains.
Differences to the normal build:

	* the fbc binary is located at the toplevel, not inside bin/
	* looks for tools inside bin/<target>/, i.e. it uses bin/<target>
	  /ld.exe instead of bin/[<target>-]ld.exe
	* looks for FB includes in inc/, not in include/freebasic/
	* looks for libraries in lib/, not in lib/freebasic/
	* does not try to rely on PATH and use system tools
	* does not try to query gcc to find files
	* CompilerOpttarget-target only accepts simple FB target names, no system triplets
	* typically used for the FB-dos and FB-win32 releases
	* uses GoRC to compile win32 resource scripts

The standalone build is intended to be used for self-contained 
installations such as the traditional FB-win32 and FB-dos releases. It also 
allows adding fbc to the PATH, without having to add the whole bin/ 
directory.

