bug#29644: gcc-objc is unusable without its 'gcc' executable.

[Zhu Zihao]

You can try with (on d05fcc21cb9509084a0424e6808b84b58dc52d62, but I
guess the commit doesn't matters.)

```
guix shell gcc@10 gcc-objc@10 clang@13

cat > hello.m << "EOF"
#include <stdio.h>

int main(int argc, const char * argv[]) {
  printf ("Hello, world!\n");
    return 0;
}
EOF
```

`LANG=C gcc hello.m -o hello` complains that Objective-C compiler is not
installed.

`LANG=C clang hello.m -o hello` can compile to hello binary.

Even I try set environment variable GCC_EXEC_PREFIX (described in
https://gcc.gnu.org/onlinedocs/gcc/Environment-Variables.html)

GCC_EXEC_PREFIX=$GUIX_ENVIRONMENT/libexec/gcc/x86_64-unknown-linux-gnu/10.3.0 
gcc hello.m -o hello
 
or pass option
`-B$GUIX_ENVIRONMENT/libexec/gcc/x86_64-unknown-linux-gnu/10.3.0`. It
still says no Objective-C compiler.


Maxime Devos <maximedevos@telenet.be> writes:

> [[PGP Signed Part:Undecided]]
> Zhu Zihao schreef op za 26-03-2022 om 13:49 [+0800]:
>> I'm planning to package some GNUStep packages to Guix, but the gcc-
>> objc is broken.
>> 
>> Any one interested in fixing GCC? [...]
>
> How is it broken?  Is there some error message or something?
>
> Greetings,
> Maxime.
>
> [[End of PGP Signed Part]]


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