[Native] Drop explicit -fPIC flag setup

We don't need to explicitly set -fPIC flag everywhere
because since d82109cc92
it is set by default for all ClangArgs users.

kotlin-native/build-tools/src/main/kotlin/org/jetbrains/kotlin/bitcode/CompileToBitcode.kt

@@ -92,7 +92,7 @@ open class CompileToBitcode @Inject constructor(
                     listOfNotNull("-std=c++17", "-Werror", "-O2",
                             "-Wall", "-Wextra",
                             "-Wno-unused-parameter",  // False positives with polymorphic functions.
-                            "-fPIC".takeIf { !HostManager().targetByName(target).isMINGW })
+                    )
             }
             return commonFlags + sanitizerFlags + languageFlags + compilerArgs
         }