[IA64] vDSO vs --build-id

When gcc uses --build-id by default, the gate.lds.S linker script runs afoul
of the new note section and produces a bad DSO image.  This fixes it.
Signed-off-by: Roland McGrath <roland@redhat.com>
Signed-off-by: Tony Luck <tony.luck@intel.com>

arch/ia64/kernel/gate.lds.S

@@ -20,6 +20,8 @@ SECTIONS
 	.gnu.version_d		: { *(.gnu.version_d) }
 	.gnu.version_r		: { *(.gnu.version_r) }
 
+	.note			: { *(.note*) }		:readable	:note
+
 	.dynamic		: { *(.dynamic) }	:readable	:dynamic
 
 	/*
@@ -83,6 +85,7 @@ PHDRS
 	epc		PT_LOAD	FILEHDR PHDRS	FLAGS(1);	/* PF_X */
 #endif
 	dynamic		PT_DYNAMIC		FLAGS(4);	/* PF_R */
+	note		PT_NOTE			FLAGS(4);	/* PF_R */
 	unwind		PT_IA_64_UNWIND;
 }