Remove reqlib modifier from tests

tests/libposix/all.T

-test('posix002', [ reqlib('unix'), omit_ways(prof_ways), fragile_for(16550, concurrent_ways) ],
+setTestOpts(when(opsys('mingw32'), skip))
+
+test('posix002', [ omit_ways(prof_ways), fragile_for(16550, concurrent_ways) ],
                  compile_and_run, [''])
 
 # Skip on mingw32: assumes existence of 'pwd' and /tmp
-test('posix003', [when(opsys('mingw32'), skip), extra_clean(['po003.out'])],
+test('posix003', [extra_clean(['po003.out'])],
                  compile_and_run, [''])
 
-test('posix004', [ reqlib('unix') ], compile_and_run, [''])
+test('posix004', [ ], compile_and_run, [''])
 
-test('posix005', [reqlib('unix') ], compile_and_run, [''])
+test('posix005', [ ], compile_and_run, [''])
 
-test('posix006', reqlib('unix'), compile_and_run, [''])
-test('posix009', [ omit_ways(threaded_ways), reqlib('unix') ], compile_and_run, [''])
-test('posix010', reqlib('unix'), compile_and_run, [''])
+test('posix006', normal , compile_and_run, [''])
+test('posix009', [ omit_ways(threaded_ways) ], compile_and_run, [''])
+test('posix010', normal, compile_and_run, [''])
 
-test('posix014', [ reqlib('unix'), omit_ways(prof_ways) ],
+test('posix014', [ omit_ways(prof_ways) ],
                  compile_and_run, [''])