Summary and Info:

When building a split package that has debug package enabled (i.e. strip and debug in options), the split package built in pacman 5.1 inherent the provide and conflict from the first package. This is a problem since the package may provide and conflict the same alternative package and when inherented by the debug package, making it impossible to install the debug package with the base package.

Steps to Reproduce:

PKGBUILD:

```
pkgbase=test0
pkgname=(test test2)
pkgver=0.1
pkgrel=1
pkgdesc="test"
provides=()
conflicts=()
arch=('x86_64')
url=""
license=('GPL')
options=(debug strip)
source=(test.c)
md5sums=('790cd3aa6d52ae2fdda43539c973442c')

build() {
gcc -Wall -Wextra -O2 test.c -o test1
gcc -Wall -Wextra -O0 test.c -o test2
}

package_test() {
provides=(other-test)
conflicts=(other-test)
install -Dm755 test1 "$pkgdir/usr/bin/test1"
}

package_test2() {
install -Dm755 test2 "$pkgdir/usr/bin/test2"
}
```

test.c
```
//

int main()
{
return 0;
}
```

The debug package built has `other-test` in `conflict` and `provides` making it not installable with `test`.