Revert "tests: add a maxrss for compiling std lib C backend .c file"

This reverts commit c75e11bf6a.

Caused this problem on some machines:
"this step declares an upper bound of 9126805504 bytes of memory,
exceeding the available 7515721728 bytes of memory".

Instead the next commit will disable std lib tests with the C backend on
Windows.

test/tests.zig

@@ -1017,7 +1017,6 @@ pub fn addModuleTests(b: *std.Build, options: ModuleTestOptions) *Step {
                 .name = qualified_name,
                 .link_libc = test_target.link_libc,
                 .target = altered_target,
-                .max_rss = if (mem.eql(u8, options.name, "std")) 9126805504 else 0,
             });
             compile_c.overrideZigLibDir("lib");
             compile_c.addCSourceFileSource(.{