Re-remove redundant OPENSSL_IA32_SSE2 from perlasm commands

See https://boringssl-review.googlesource.com/c/boringssl/+/65869. I
accidentally reintroduced them with the new tool due to a mismerge.
(This doesn't change the output.)

Change-Id: I2393d120d5be27355f2cbd7b05a687e65e34dd4a
Reviewed-on: https://boringssl-review.googlesource.com/c/boringssl/+/68290
Auto-Submit: David Benjamin <davidben@google.com>
Reviewed-by: Bob Beck <bbe@google.com>
Commit-Queue: David Benjamin <davidben@google.com>
diff --git a/util/pregenerate/build.go b/util/pregenerate/build.go
index 4d8bbcd..57e83c8 100644
--- a/util/pregenerate/build.go
+++ b/util/pregenerate/build.go
@@ -117,9 +117,9 @@
 		addPerlasmTask(&out.Asm, &p, "-linux.S", []string{"linux32"})
 	}
 	for _, p := range in.PerlasmX86 {
-		addPerlasmTask(&out.Asm, &p, "-apple.S", []string{"macosx", "-fPIC", "-DOPENSSL_IA32_SSE2"})
-		addPerlasmTask(&out.Asm, &p, "-linux.S", []string{"elf", "-fPIC", "-DOPENSSL_IA32_SSE2"})
-		addPerlasmTask(&out.Nasm, &p, "-win.asm", []string{"win32n", "-fPIC", "-DOPENSSL_IA32_SSE2"})
+		addPerlasmTask(&out.Asm, &p, "-apple.S", []string{"macosx", "-fPIC"})
+		addPerlasmTask(&out.Asm, &p, "-linux.S", []string{"elf", "-fPIC"})
+		addPerlasmTask(&out.Nasm, &p, "-win.asm", []string{"win32n", "-fPIC"})
 	}
 	for _, p := range in.PerlasmX86_64 {
 		addPerlasmTask(&out.Asm, &p, "-apple.S", []string{"macosx"})