core/layout.inc: we don't need the _lma symbols except in one case

We don't need any of the _lma symbols, except for the one associated
with .pm_code.  Don't export them unconditionally in SECINFO, because
that makes the linker request them as unknown symbols in the dynamic
section.

Signed-off-by: H. Peter Anvin <hpa@zytor.com>

core/layout.inc

@@ -101,9 +101,10 @@ RBFG_brainfuck:	resb 2048		; Bigger than an Ethernet packet...
 
 		; Symbols from linker script
 %macro SECINFO 1
-		extern __%1_start, __%1_lma, __%1_end
+		extern __%1_start, __%1_end
 		extern __%1_len, __%1_dwords
 %endmacro
+
 		SECINFO bss16
 		SECINFO uibss
 		SECINFO config
@@ -112,6 +113,7 @@ RBFG_brainfuck:	resb 2048		; Bigger than an Ethernet packet...
 
 		SECINFO pm_code
 		SECINFO high_clear
+		extern __pm_code_lma
 
 		SECINFO bss