Fix -Wunused-function warning in ext/pdo_firebird (#15646)

When FB_API_VER equals to 30, for example, on Ubuntu, there is this
warning thrown with certain compiler configurations:

Fix -Wunused-function warning in ext/pdo_firebird (#15646)

When FB_API_VER equals to 30, for example, on Ubuntu, there is this
warning thrown with certain compiler configurations:

/php-src/ext/pdo_firebird/pdo_firebird_utils.cpp:21:13: warning:
‘void fb_copy_status(const ISC_STATUS*, ISC_STATUS*, size_t)’
defined but not used [-Wunused-function]
21 | static void fb_copy_status(const ISC_STATUS* from, ISC_STATUS* to, size_t maxLength)
| ^~~~~~~~~~~~~~

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Trim trailing whitespace (#15649)

[skip ci]

pdo_firebird: Formatting time zone types

As a follow-up to the commit which introduced support for Firebird 4.0+
data types[1], we add support for formats for types with time zones.

pdo_firebird: Formatting time zone types

As a follow-up to the commit which introduced support for Firebird 4.0+
data types[1], we add support for formats for types with time zones.

Since this uses the newer Firebird C++ API, pdo_firebird now requires a
C++ compiler to be built.

[1] <https://github.com/php/php-src/pull/14897>

Co-authored-by: Christoph M. Becker <cmbecker69@gmx.de>

Closes GH-15230.

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