MIPS: elf2ecoff: Ignore PT_MIPS_ABIFLAGS program headers.

These are generated by very recent toolchains and result in an error
message when attenpting to convert a kernel from ELF to ECOFF.
Signed-off-by: NRalf Baechle <ralf@linux-mips.org>

arch/mips/boot/elf2ecoff.c

@@ -50,6 +50,7 @@
  * Some extra ELF definitions
  */
 #define PT_MIPS_REGINFO 	0x70000000	/* Register usage information */
+#define PT_MIPS_ABIFLAGS	0x70000003	/* Records ABI related flags  */
 
 /* -------------------------------------------------------------------- */
 
@@ -354,6 +355,7 @@ int main(int argc, char *argv[])
 		case PT_NOTE:
 		case PT_PHDR:
 		case PT_MIPS_REGINFO:
+		case PT_MIPS_ABIFLAGS:
 			continue;
 
 		case PT_LOAD: