disable code which uses attribute(target_clones) to provide functions
optimized for different CPUs. apparently clang 15 adds supports for this,
but we don't have ifunc support in the toolchain, so it fails to link.

Index: src/common/darktable.h
--- src/common/darktable.h.orig
+++ src/common/darktable.h
@@ -126,14 +126,14 @@ typedef unsigned int u_int;
 /* Create cloned functions for various CPU SSE generations */
 /* See for instructions https://hannes.hauswedell.net/post/2017/12/09/fmv/ */
 /* TL;DR : use only on SIMD functions containing low-level paralellized/vectorized loops */
-#if __has_attribute(target_clones) && !defined(_WIN32) && (defined(__amd64__) || defined(__amd64) || defined(__x86_64__) || defined(__x86_64))
-#define __DT_CLONE_TARGETS__ __attribute__((target_clones("default", "sse2", "sse3", "sse4.1", "sse4.2", "popcnt", "avx", "avx2", "avx512f", "fma4")))
-#elif __has_attribute(target_clones) && !defined(_WIN32) && defined(__PPC64__)
-/* __PPC64__ is the only macro tested for in is_supported_platform.h, other macros would fail there anyway. */
-#define __DT_CLONE_TARGETS__ __attribute__((target_clones("default","cpu=power9")))
-#else
+// #if __has_attribute(target_clones) && !defined(_WIN32) && (defined(__amd64__) || defined(__amd64) || defined(__x86_64__) || defined(__x86_64))
+// #define __DT_CLONE_TARGETS__ __attribute__((target_clones("default", "sse2", "sse3", "sse4.1", "sse4.2", "popcnt", "avx", "avx2", "avx512f", "fma4")))
+// #elif __has_attribute(target_clones) && !defined(_WIN32) && defined(__PPC64__)
+// /* __PPC64__ is the only macro tested for in is_supported_platform.h, other macros would fail there anyway. */
+// #define __DT_CLONE_TARGETS__ __attribute__((target_clones("default","cpu=power9")))
+// #else
 #define __DT_CLONE_TARGETS__
-#endif
+// #endif
 
 /* Helper to force heap vectors to be aligned on 64 bits blocks to enable AVX2 */
 #define DT_ALIGNED_ARRAY __attribute__((aligned(64)))
