[build] Fix building on Ubuntu 8.04

Not fully understood, but it seems that the LMA of bss sections matters
for some newer binutils builds.  Force all bss sections to have an LMA
at the end of the file, so that they don't interfere with other
sections.

The symptom was that objcopy -O binary -j .zinfo would extract the
.zinfo section from bin/xxx.tmp as a blob of the correct length, but
with zero contents.  This would then cause the [ZBIN] stage of the
build to fail.

Also explicitly state that .zinfo(.*) sections have @progbits, in case
some future assembler or linker variant decides to omit them.

src/arch/i386/prefix/dskprefix.S

 	ljmp	$SYSSEG, $start_runtime
 
 endseg:	.word SYSSEG + _filesz_pgh
-	.section ".zinfo.fixup", "a"	/* Compressor fixup information */
+	.section ".zinfo.fixup", "a", @progbits	/* Compressor fixups */
 	.ascii	"SUBW"
 	.long	endseg
 	.long	16

src/arch/i386/prefix/hdprefix.S

 load_length:
 	.long	_filesz_sect
 	
-	.section ".zinfo.fixup", "a"	/* Compressor fixup information */
+	.section ".zinfo.fixup", "a", @progbits	/* Compressor fixups */
 	.ascii	"SUBL"
 	.long	load_length
 	.long	512

src/arch/i386/prefix/libprefix.S

 
 	/* File split information for the compressor */
 #if COMPRESS
-	.section ".zinfo", "a"
+	.section ".zinfo", "a", @progbits
 	.ascii	"COPY"
 	.long	_prefix_lma
 	.long	_prefix_filesz
 	.long	_textdata_filesz
 	.long	_max_align
 #else /* COMPRESS */
-	.section ".zinfo", "a"
+	.section ".zinfo", "a", @progbits
 	.ascii	"COPY"
 	.long	_prefix_lma
 	.long	_filesz

src/arch/i386/prefix/lkrnprefix.S

 syssize: 
 	.long	_filesz_pgh - PREFIXPGH
 
-	.section ".zinfo.fixup", "a"	/* Compressor fixup information */
+	.section ".zinfo.fixup", "a", @progbits	/* Compressor fixups */
 	.ascii	"SUBL"
 	.long	syssize
 	.long	16

src/arch/i386/prefix/nbiprefix.S

 memlen:	.long	_filesz - 512
 	.size	segment_header, . - segment_header
 
-	.section ".zinfo.fixup", "a"	/* Compressor fixup information */
+	.section ".zinfo.fixup", "a", @progbits	/* Compressor fixups */
 	.ascii	"SUBL"
 	.long	imglen
 	.long	1

src/arch/i386/prefix/romprefix.S

 	.word	pnpheader
 	.size romheader, . - romheader
 	
-	.section ".zinfo.fixup", "a"	/* Compressor fixup information */
+	.section ".zinfo.fixup", "a", @progbits	/* Compressor fixups */
 	.ascii	"SUBB"
 	.long	romheader_size
 	.long	512
 	.equ pciheader_len, . - pciheader
 	.size pciheader, . - pciheader
 	
-	.section ".zinfo.fixup", "a"	/* Compressor fixup information */
+	.section ".zinfo.fixup", "a", @progbits	/* Compressor fixups */
 	.ascii	"SUBW"
 	.long	pciheader_image_length
 	.long	512

src/arch/i386/scripts/i386.lds

 	*(.prefix)
 	*(.prefix.*)
 	_mprefix = .;
-    } .prefix_bss (NOLOAD) : {
+    } .prefix_bss (NOLOAD) : AT ( _end_lma ) {
 	_eprefix = .;
     }
     _prefix_filesz	= ABSOLUTE ( _mprefix - _prefix );
 	*(.text16)
 	*(.text16.*)
 	_mtext16 = .;
-    } .text16_bss (NOLOAD) : {
+    } .text16_bss (NOLOAD) : AT ( _end_lma ) {
 	_etext16 = .;
     }
     _text16_filesz	= ABSOLUTE ( _mtext16 - _text16 );
 	*(.data16)
 	*(.data16.*)
 	_mdata16 = .;
-    } .data16_bss (NOLOAD) : {
+    } .data16_bss (NOLOAD) : AT ( _end_lma ) {
 	*(.bss16)
 	*(.bss16.*)
 	*(.stack16)
 	*(.data.*)
 	*(SORT(.tbl.*))		/* Various tables.  See include/tables.h */
 	_mtextdata = .;
-    } .textdata_bss (NOLOAD) : {
+    } .textdata_bss (NOLOAD) : AT ( _end_lma ) {
 	*(.bss)
 	*(.bss.*)
 	*(COMMON)
 	*(.zinfo)
 	*(.zinfo.*)
 	_mzinfo = .;
-    } .zinfo_bss (NOLOAD) : {
+    } .zinfo_bss (NOLOAD) : AT ( _end_lma ) {
 	_ezinfo = .;
     }
     _zinfo_filesz	= ABSOLUTE ( _mzinfo - _zinfo );
      *
      */
 
-    .weak 0x0 : {
+    .weak 0x0 : AT ( _end_lma ) {
 	_weak = .;
 	*(.weak)
 	_eweak = .;
     .			+= _zinfo_filesz;
     .			= ALIGN ( _max_align );
 
+    _end_lma		= .;
+
     /*
      * Values calculated to save code from doing it
      *