add SWOOLE_ODBC_LIBS variable to config.m4

[henderkes]

Background: when statically compiling libodbc.a with libiconv.a, linking against only libodbc.a leads to unresolved external symbols to libiconv_* functions.

Here we add an optional SWOOLE_ODBC_LIBC variable if the odbc library needs more than to link against a single library.

Now ./configure --enable-swoole-odbc=unixodbc,/path/to/unixodbc SWOOLE_ODBC_LIBS="-lodbc -liconv" succeeds.

Feel free to change this to a better way if you can think of one! crazywhalecc/static-php-cli#864

[Copilot]

Pull Request Overview

This PR adds support for specifying custom ODBC library linking flags through a new SWOOLE_ODBC_LIBS environment variable to address linking issues when statically compiling ODBC libraries with additional dependencies like libiconv.

• Introduces optional SWOOLE_ODBC_LIBS variable to specify custom linking flags for ODBC
• Refactors library checking from PHP_CHECK_LIBRARY to AC_LINK_IFELSE for better compatibility with custom library configurations
• Preserves existing behavior when SWOOLE_ODBC_LIBS is not set

Comments suppressed due to low confidence (1)

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[matyhtf]

The save_LIBS should be changed to uppercase

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 86.13%. Comparing base (8057ba9) to head (d5676e8).
⚠️ Report is 6 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5847      +/-   ##
==========================================
- Coverage   86.15%   86.13%   -0.03%     
==========================================
  Files         109      109              
  Lines       16820    16820              
  Branches     2975     2975              
==========================================
- Hits        14492    14488       -4     
- Misses       2328     2332       +4     

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