Build configuration options

The following build configuration options are used by iPXE. Build configuration options may be modified by editing the relevant C header file before building the iPXE source code.

`config/general.h`
`DOWNLOAD_PROTO_HTTPS`	Secure Hypertext Transfer Protocol
`NET_PROTO_FCOE`	Fibre Channel over Ethernet protocol
`FCMGMT_CMD`	Fibre Channel management commands
`IMAGE_TRUST_CMD`	Image trust management commands
`LOTEST_CMD`	Loopback testing command
`NSLOOKUP_CMD`	Name resolution command
`REBOOT_CMD`	Reboot command
`TIME_CMD`	Time command
`VLAN_CMD`	VLAN commands
`GDBSERIAL`	Remote GDB debugging via serial port
`GDBUDP`	Remote GDB debugging via UDP

`config/console.h`
`CONSOLE_PCBIOS`	Default BIOS console
`CONSOLE_SERIAL`	Serial port console
`CONSOLE_SYSLOG`	Syslog console
`CONSOLE_SYSLOGS`	Encrypted syslog console
`CONSOLE_VMWARE`	VMware logfile console
`KEYBOARD_MAP`	BIOS console keyboard map
`LOG_LEVEL`	Log message level

`config/serial.h`
`COMCONSOLE`	I/O port address
`COMSPEED`	Baud rate
`COMDATA`	Data bits
`COMPARITY`	Parity
`COMSTOP`	Stop bits

`config/sideband.h`
`VMWARE_SETTINGS`	VMware GuestInfo settings