add a workaround for building issues with newer compilers · Pull Request !207 · src-openEuler/bash

1. add a workaround for building issues with newer compilers

sibling of !206

```
[ 2273s] shell.c: In function 'parse_shell_options':
[ 2273s] shell.c:918:14: warning: suggest parentheses around assignment used as truth value [-Wparentheses]
[ 2273s]   918 |       while (arg_character = arg_string[i++])
[ 2273s]       |              ^~~~~~~~~~~~~
[ 2273s] shell.c: In function 'disable_priv_mode':
[ 2273s] shell.c:1341:7: warning: variable 'e' set but not used [-Wunused-but-set-variable]
[ 2273s]  1341 |   int e;
[ 2273s]       |       ^
[ 2273s] shell.c: In function 'open_shell_script':
[ 2273s] shell.c:1581:7: error: 'return' with no value, in function returning non-void [-Wreturn-mismatch]
[ 2273s]  1581 |       return;
[ 2273s]       |       ^~~~~~
[ 2273s] shell.c:1564:1: note: declared here
[ 2273s]  1564 | open_shell_script (script_name)
[ 2273s]       | ^~~~~~~~~~~~~~~~~
[ 2273s] shell.c:1594:11: error: 'return' with no value, in function returning non-void [-Wreturn-mismatch]
[ 2273s]  1594 |           return;
[ 2273s]       |           ^~~~~~
[ 2273s] shell.c:1564:1: note: declared here
[ 2273s]  1564 | open_shell_script (script_name)
[ 2273s]       | ^~~~~~~~~~~~~~~~~
[ 2273s] make: *** [Makefile:106: shell.o] Error 1
[ 2273s] make: *** Waiting for unfinished jobs....
```

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