Case mismatch between ZPlainDbLibDriver unit declaration and references in ZDbcDbLibResultSet.pas (causing compilation error on Linux)

[edsontmarques]

Description
When compiling ZeosLib with Free Pascal on a case-sensitive filesystem (Linux), the build fails because of an inconsistent capitalization in the unit name.

• The file is named ZPlainDbLibDriver.pas, and the unit inside it is declared as unit ZPlainDbLibDriver; (lowercase b).
• However, in ZDbcDbLibResultSet.pas, the unit is referenced as ZPlainDBLibDriver (uppercase B).

Since Linux filesystems are case-sensitive, this mismatch prevents the compiler from locating the unit, even if the search path is correct.

---

Environment

• OS: Ubuntu 25.10 (Linux, case-sensitive filesystem)
• Lazarus 4.0
• FPC 3.2
• ZeosLib: latest master (commit <insert commit hash here>)

---

Steps to Reproduce

1. Clone ZeosLib from GitHub.

2. Compile any project that uses ZDbcDbLibResultSet.pas with Free Pascal on Linux.

3. The compiler will fail with:

   Fatal: Can't find unit ZPlainDBLibDriver used by ZDbcDbLibResultSet
   

---

Expected Behavior
The code should compile without case-sensitivity issues, regardless of operating system.

---

Actual Behavior
Compilation fails because the compiler cannot find ZPlainDBLibDriver, due to the case mismatch.

---

Suggested Fix
Ensure consistent naming across all units:

• Either rename the unit declaration and file to ZPlainDBLibDriver (uppercase B)
• Or update all references in other units to match the existing ZPlainDbLibDriver (lowercase b).

Consistency is crucial for case-sensitive filesystems like Linux.

---

Additional Notes
This issue is not visible on Windows because the filesystem is case-insensitive, but it breaks the build on Linux and other Unix-like systems.