Function parse_pkgbuild_deps 

pub fn parse_pkgbuild_deps(
    pkgbuild: &str,
) -> (Vec<String>, Vec<String>, Vec<String>, Vec<String>)

What: Parse dependencies from PKGBUILD content.

Inputs:

• pkgbuild: Raw PKGBUILD file content.

Output:

• Returns a tuple of (depends, makedepends, checkdepends, optdepends) vectors.

Details:

• Parses bash array syntax: depends=('foo' 'bar>=1.2') (single-line)
• Also handles depends+= patterns used in functions like package()
• Handles both quoted and unquoted dependencies
• Also handles multi-line arrays:

  depends=(
      'foo'
      'bar>=1.2'
  )

• Filters out .so files (virtual packages) and invalid package names
• Only parses specific dependency fields (depends, makedepends, checkdepends, optdepends)