Fix SQLite3 include path for compare command

[iamazeem]

Environment

• Ubuntu 20.04 LTS (GitHub-hosted runner image being used in the CI workflow)
• Ubuntu 22.04 LTS (local machine)

Description

Makefile was not using the SQLite3 headers from the external libs directory.

Affected failing tests:

• test-compare
• test-compare-tolerance

Steps to reproduce

Make sure the SQLite3 dev packages are not preinstalled on the system.
For example, on Ubuntu, check if sqlite3.h is present e.g. whereis sqlite3.h.
If it exists, uninstall it i.e. sudo apt remove -y libsqlite3-dev.

Run:

cd app/test
make test-compare
make test-compare-tolerance

Error:

compare.c:17:10: fatal error: sqlite3.h: No such file or directory
   17 | #include <sqlite3.h>
      |          ^~~~~~~~~~~
compilation terminated.
make[1]: *** [Makefile:442: ~/zsv/build/Linux/rel/gcc/bin/zsv_compare] Error 1
make[1]: Leaving directory '~/zsv/app'
make: *** [Makefile:438: ~/zsv/build/Linux/rel/gcc/bin/zsv_compare] Error 2

On the configured Ubuntu runner i.e. Ubuntu 20.04, the package libsqlite3-dev is preinstalled.
That's why it was undetected so far.

Same was the case on my local machine.
Verified by uninstalling the libsqlite3-dev previously installed via apt package.

Signed-off-by: Azeem Sajid [email protected]