testsuite: i386: Fix g++.target/i386/pr97054.C on Solaris

testsuite: i386: Fix g++.target/i386/pr97054.C on Solaris

g++.target/i386/pr97054.C currently FAILs on 64-bit Solaris/x86:

FAIL: g++.target/i386/pr97054.C  -std=gnu++14 (test for excess errors)
UNRESOLVED: g++.target/i386/pr97054.C  -std=gnu++14 compilation failed to produce executable
FAIL: g++.target/i386/pr97054.C  -std=gnu++17 (test for excess errors)
UNRESOLVED: g++.target/i386/pr97054.C  -std=gnu++17 compilation failed to produce executable
FAIL: g++.target/i386/pr97054.C  -std=gnu++2a (test for excess errors)
UNRESOLVED: g++.target/i386/pr97054.C  -std=gnu++2a compilation failed to produce executable
FAIL: g++.target/i386/pr97054.C  -std=gnu++98 (test for excess errors)
UNRESOLVED: g++.target/i386/pr97054.C  -std=gnu++98 compilation failed to produce executable

Excess errors:
/vol/gcc/src/hg/master/local/gcc/testsuite/g++.target/i386/pr97054.C:49:20: error: frame pointer required, but reserved

Since Solaris/x86 defaults to -fno-omit-frame-pointer, this patch
explicitly builds with -fomit-frame-pointer as is the default on other
x86 targets.

Tested on i386-pc-solaris2.11 (32 and 64-bit) and x86_64-pc-linux-gnu.

2024-05-15  Rainer Orth  <ro@CeBiTec.Uni-Bielefeld.DE>

	gcc/testsuite:
	* g++.target/i386/pr97054.C (dg-options): Add -fomit-frame-pointer.