Canadian-cross compilers are built from build.sh if necessary
|BUILD|
* OBJFORMAT is used for informing other scripts of the object format type
* Installers are created if CREATEINSTALLER is "YES"
[build-coff.sh]
* MPFR and GMP have been added, as they are required for GCC
* Currently the Canadian-cross compiler is broken
[build-gcc.sh]
* Re-instated make all-target-libgcc
[build.sh]
* If the host and build architectures differ, the Canadian-cross compiler is
  built
[download.sh]
* Using "if [ -n ... ]" instead of "if [ -z ... ] ... else" for clarity
* Corrected the GMP FTP location (missing gmp-)
* Corrected the MPFR GPG verification initial if statement

|INSTALLER|
* Added more detail in the display name and description to identify the host
  architecture and object format