Add tests to check the existence of math constants

4 jobs from test-math-consts in 10 minutes and 43 seconds (queued for 1 second)
Status Job ID Name Coverage
  Build
passed #4748
build:linux

05:39

passed #4749
build:redox

06:36

 
  Test
failed #4751
allowed to fail
fmt

00:38

failed #4750
test:linux

04:06

 
Name Stage Failure
failed
test:linux Test
math.c:18:34: error: 'M_SQRT1_2' undeclared (first use in this function)
printf("M_SQRT1_2 = %.4f\n", M_SQRT1_2);
^~~~~~~~~
Makefile:166: recipe for target 'bins/math' failed
make[1]: Leaving directory '/builds/xTibor/relibc/tests'
make[1]: *** [bins/math] Error 1
make: *** [test] Error 2
Makefile:64: recipe for target 'test' failed
ERROR: Job failed: exit code 1
failed
fmt Test
-        static __init_array_start:    extern "C" fn();
- static __init_array_end: extern "C" fn();
+ static __preinit_array_end: extern "C" fn();
+ static __init_array_start: extern "C" fn();
+ static __init_array_end: extern "C" fn();

fn _init();
fn main(argc: isize, argv: *const *const c_char, envp: *const *const c_char) -> c_int;
ERROR: Job failed: exit code 1