test: increase the tolerance threshold to account for compiler optimisations

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---

Author: anandkaranubc

lib/node_modules/@stdlib/math/base/special/gammainc/test/test.native.js

@@ -447,8 +447,8 @@ tape( 'the function correctly evaluates the unregularized lower incomplete gamma
 			t.strictEqual( isSameValue( actual, PINF ), true, 'returns expected value' );
 			continue;
 		}
-		// NOTE: The difference is high because some of the expected values are very large.
-		t.strictEqual( ulpdiff( actual, expected[ i ] ) <= 534, true, 'returns expected value within 534 ulp' );
+		// NOTE: The difference is high because some of the expected values are very large and the compiler optimizations have been disabled.
+		t.strictEqual( ulpdiff( actual, expected[ i ] ) <= 947, true, 'returns expected value within 947 ulp' );
 	}
 	t.end();
 });
@@ -470,8 +470,8 @@ tape( 'the function correctly evaluates the unregularized upper incomplete gamma
 			t.strictEqual( isSameValue( actual, PINF ), true, 'returns expected value' );
 			continue;
 		}
-		// NOTE: The difference is high because some of the expected values are very large.
-		t.strictEqual( ulpdiff( actual, expected[ i ] ) <= 969, true, 'returns expected value within 969 ulp' );
+		// NOTE: The difference is high because some of the expected values are very large and the compiler optimizations have been disabled.
+		t.strictEqual( ulpdiff( actual, expected[ i ] ) <= 1544, true, 'returns expected value within 1544 ulp' );
 	}
 	t.end();
 });