chachap10-ppc.pl: Fix truncated relocation

Fix error: relocation truncated to fit: R_PPC64_REL14 (stub)
against symbol `ChaCha20_ctr32_vsx_8x'

CLA: trivial

Reviewed-by: Tom Cosgrove <tom.cosgrove@arm.com>
Reviewed-by: Tomas Mraz <tomas@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/23618)

crypto/chacha/asm/chachap10-ppc.pl

@@ -170,7 +170,9 @@ $code.=<<___;
 .align	5
 .ChaCha20_ctr32_vsx_p10:
 	${UCMP}i $len,255
-	bgt 	ChaCha20_ctr32_vsx_8x
+	ble	.Not_greater_than_8x
+	b	ChaCha20_ctr32_vsx_8x
+.Not_greater_than_8x:
 	$STU	$sp,-$FRAME($sp)
 	mflr	r0
 	li	r10,`15+$LOCALS+64`