[clang-tidy] misc-include-cleaner does not handle error codes in <errno.h>

[abdelmaged]

Source C File:

#include <errno.h>
#include <stdio.h>

static void testErrno(void) {
  if (errno == EEXIST) {
    puts("Already Exists!");
  }
}

Using clang-tidy misc-include-cleaner:

<source>:5:16: warning: no header providing "EEXIST" is directly included [misc-include-cleaner]
    1 | #include <errno.h>
    2 | #include <stdio.h>
    3 | 
    4 | static void testErrno(void) {
    5 |   if (errno == EEXIST) {
      |                ^
1 warning generated.

Issue also reproducible in this link:
https://godbolt.org/z/xMo84z8oz

clang-tidy version: 20.1.1
This warning was not produced in 18.1.6

[llvmbot]

@llvm/issue-subscribers-clang-tidy

Author: None (abdelmaged)

Source C File: ```c #include <errno.h> #include <stdio.h>

static void testErrno(void) {
if (errno == EEXIST) {
puts("Already Exists!");
}
}

Using clang-tidy misc-include-cleaner:

source>:5:16: warning: no header providing "EEXIST" is directly included [misc-include-cleaner]
1 | #include <errno.h>
2 | #include <stdio.h>
3 |
4 | static void testErrno(void) {
5 | if (errno == EEXIST) {
| ^
1 warning generated.

Issue also reproducible in this link:
https://godbolt.org/z/xMo84z8oz

</details>

[llvmbot]

@llvm/issue-subscribers-clang-include-cleaner

Author: None (abdelmaged)

Source C File: ```c #include <errno.h> #include <stdio.h>

static void testErrno(void) {
if (errno == EEXIST) {
puts("Already Exists!");
}
}

Using clang-tidy misc-include-cleaner:

<source>:5:16: warning: no header providing "EEXIST" is directly included [misc-include-cleaner]
1 | #include <errno.h>
2 | #include <stdio.h>
3 |
4 | static void testErrno(void) {
5 | if (errno == EEXIST) {
| ^
1 warning generated.

Issue also reproducible in this link:
https://godbolt.org/z/xMo84z8oz

clang-tidy version: 20.1.1
This warning was **not** produced in 18.1.6
</details>