AVR: Add support for .gnu_attribute

[Alan Modra]

Applied.  Fixes
FAIL: GNU attributes v1/v2: no support for directive .gnu_attribute

	PR gas/34305
	* testsuite/lib/binutils-common.exp (supports_oa_v1): Add avr.

diff --git a/binutils/testsuite/lib/binutils-common.exp b/binutils/testsuite/lib/binutils-common.exp
index 3c7ca48dbe4..e7e8c223389 100644
--- a/binutils/testsuite/lib/binutils-common.exp
+++ b/binutils/testsuite/lib/binutils-common.exp
@@ -540,6 +540,7 @@ proc supports_oa_v1 {} {
     }
     if { [istarget arc-*-*]
 	 || [istarget arm*-*-*]
+	 || [istarget avr-*-*]
 	 || [istarget csky*-*-*]
 	 || [istarget loongarch*-*-*]
 	 || [istarget m68*-*-*]

-- 
Alan Modra