use pkg-config and allow build when cpp-driver use CASS_INSTALL_HEADE… #141
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…R_IN_SUBDIR
It will be even simpler to be able to use the
PHP_EVAL_INCLINEandPHP_EVAL_LIBLINEbut sadly cassandra.pc is broken for now, see datastax/cpp-driver#465Using pkg-config is simpler and better, and widely used since PHP 7.4 (using the
PKG_CHECK_MODULESmacro), this proposal still suitable for older version