testsuite: i386: Fix gcc.target/i386/pr71321.c on Solaris/x86

gcc.target/i386/pr71321.c FAILs on 64-bit Solaris/x86 with the native
assembler:

FAIL: gcc.target/i386/pr71321.c scan-assembler-not lea.*0

The problem is that /bin/as doesn't fully support cfi directives, so the
.eh_frame section is specified explicitly, which includes ".long 0".
The regular expression above includes ".*", which does multiline
matches.  AFAICS those aren't needed here.

This patch changes the RE not to use multiline patches.

Tested on i386-pc-solaris2.11 (as and gas) and i686-pc-linux-gnu.

2024-02-01  Rainer Orth  <ro@CeBiTec.Uni-Bielefeld.DE>

	gcc/testsuite:
	* gcc.target/i386/pr71321.c (scan-assembler-not): Avoid multiline
	matches.

gcc/testsuite/gcc.target/i386/pr71321.c

@@ -12,4 +12,4 @@ unsigned cvt_to_2digit_ascii(uint8_t i)
 {
   return cvt_to_2digit(i, 10) + 0x0a3030;
 }
-/* { dg-final { scan-assembler-not "lea.*0" } } */
+/* { dg-final { scan-assembler-not "lea\[^\n\r]*0" } } */