Remove the now unnecessary files (merge-srec.pl, ldscript-ram-jtag)
Note that this drops the dependency on perl for bootrom build, so end-users who don't touch the FPGA bitstream will not need perl anymore
- Cleaned up Makefile.linux in armsrc directory
- Added Linux toolchain build script in tools directory
- Made LCD support optional (disabled by default) in armsrc
- Small formatting changes