[legal] Add a selection of FILE_LICENCE declarations

Add FILE_LICENCE declarations to almost all files that make up the
various standard builds of gPXE.

src/arch/i386/prefix/bootpart.S

@@ -1,3 +1,5 @@
+FILE_LICENCE ( GPL2_OR_LATER )
+
 #define BOOT_SEG	0x07c0
 #define EXEC_SEG	0x0100
 #define STACK_SEG 	0x0200

src/arch/i386/prefix/dskprefix.S

@@ -16,6 +16,8 @@
  * getting whole tracks at a time whenever possible.
  */
 
+FILE_LICENCE ( GPL2_ONLY )
+
 .equ	BOOTSEG, 0x07C0			/* original address of boot-sector */
 
 .equ	SYSSEG, 0x1000			/* system loaded at SYSSEG<<4 */

src/arch/i386/prefix/hdprefix.S

@@ -1,3 +1,5 @@
+FILE_LICENCE ( GPL2_OR_LATER )
+
 	.text
 	.arch i386
 	.section ".prefix", "awx", @progbits

src/arch/i386/prefix/kkpxeprefix.S

@@ -3,6 +3,8 @@
  *****************************************************************************
  */
 
+FILE_LICENCE ( GPL2_OR_LATER )
+
 #define PXELOADER_KEEP_UNDI
 #define PXELOADER_KEEP_PXE
 #include "pxeprefix.S"

src/arch/i386/prefix/kpxeprefix.S

@@ -3,5 +3,7 @@
  *****************************************************************************
  */
 
+FILE_LICENCE ( GPL2_OR_LATER )
+
 #define PXELOADER_KEEP_UNDI
 #include "pxeprefix.S"

src/arch/i386/prefix/libprefix.S

@@ -17,6 +17,8 @@
  *
  */
 
+FILE_LICENCE ( GPL2_OR_LATER )
+
 	.arch i386
 
 /**

src/arch/i386/prefix/lkrnprefix.S

@@ -34,6 +34,8 @@
 
 */
 
+FILE_LICENCE ( GPL_ANY )
+
 #define	SETUPSECS 4		/* Minimal nr of setup-sectors */
 #define PREFIXSIZE ((SETUPSECS+1)*512)
 #define PREFIXPGH (PREFIXSIZE / 16 )

src/arch/i386/prefix/pxeprefix.S

@@ -1,3 +1,5 @@
+FILE_LICENCE ( GPL2_OR_LATER )
+
 #define PXENV_UNDI_SHUTDOWN		0x0005
 #define	PXENV_UNDI_GET_NIC_TYPE		0x0012
 #define PXENV_UNDI_GET_IFACE_INFO	0x0013

src/arch/i386/prefix/unnrv2b.S

@@ -20,6 +20,8 @@
  *   Michael Brown 9 Mar 2005
  */
 
+FILE_LICENCE ( GPL2_OR_LATER )
+
 /****************************************************************************
  * This file provides the decompress() and decompress16() functions
  * which can be called in order to decompress an image compressed with

src/arch/i386/prefix/unnrv2b16.S

@@ -3,5 +3,7 @@
  *
  */
 
+FILE_LICENCE ( GPL2_OR_LATER )
+
 #define CODE16
 #include "unnrv2b.S"