Make nested EXEC SQL available

[tsh-hashimoto]

When a file specified by EXEC SQL INCLUDE contains additional EXEC SQL statements, the corresponding CALL statements were not generated in the converted output.
This pull request addresses and resolves that issue.

When expanding the contents of a file specified by EXEC SQL INCLUDE, markers are added at the beginning and end in the intermediate file to indicate the range of the included content.

       PROCEDURE DIVISION.     
OCESQL*    EXEC SQL INCLUDE INSERT_AKKM010T END-EXEC.
>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> incfile start: INSERT_AKKM010T
OCESQL     EXEC SQL
OCESQL          INSERT INTO AKKM010T (ID, NAME)
OCESQL          VALUES (:WS-ID, :WS-NAME)
OCESQL     END-EXEC.
<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<< incfile end: INSERT_AKKM010T
           STOP RUN.

In the ppoutput function in ppout.c, the intermediate file is read line by line, and processing is performed based on the content of each line. However, if a line contains the INCLUDE start or end marker, it is skipped using continue.

To address this, the code was modified to check whether the line with the marker immediately follows an END-EXEC. line before skipping. If it does, the corresponding CALL statement is now properly generated.

[Copilot]

Pull Request Overview

This PR fixes an issue where nested EXEC SQL statements within included files were not properly generating corresponding CALL statements in the converted output. The fix ensures that when processing included files with SQL statements, the necessary SQL call generation logic is triggered at the correct boundaries.

• Adds logic to detect when an include file marker follows an END-EXEC statement
• Generates proper CALL statements for SQL commands found in included files
• Adds comprehensive test coverage for the nested SQL include scenario

Reviewed Changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 2 comments.

File	Description
ocesql/ppout.c	Core fix that checks for END-EXEC boundaries when processing include file markers and triggers SQL call generation
tests/basic.src/include.at	New test case that verifies nested EXEC SQL statements in included files generate proper CALL statements
tests/basic	Generated test file containing the expanded test case for the build system