refactor: replace SPC_LIBC with SPC_TARGET and update related logic

src/SPC/builder/unix/library/pkgconfig.php

@@ -4,8 +4,8 @@ declare(strict_types=1);
 
 namespace SPC\builder\unix\library;
 
-use SPC\builder\linux\library\LinuxLibraryBase;
 use SPC\util\executor\UnixAutoconfExecutor;
+use SPC\util\SPCTarget;
 
 trait pkgconfig
 {
@@ -14,7 +14,7 @@ trait pkgconfig
         UnixAutoconfExecutor::create($this)
             ->appendEnv([
                 'CFLAGS' => PHP_OS_FAMILY !== 'Linux' ? '-Wimplicit-function-declaration -Wno-int-conversion' : '',
-                'LDFLAGS' => !($this instanceof LinuxLibraryBase) || getenv('SPC_LIBC') === 'glibc' ? '' : '--static',
+                'LDFLAGS' => SPCTarget::isStaticTarget() ? '--static' : '',
             ])
             ->configure(
                 '--with-internal-glib',