Fix CONFIG_X86_DEBUG_FPU build failure

When CONFIG_X86_DEBUG_FPU is defined the alternatives_patched symbol
is pulled in as a dependency which results in a build failure.  To
prevent this undefine CONFIG_X86_DEBUG_FPU to disable the WARN_ON_FPU()
macro and rely on WARN_ON_ONCE debugging checks which were previously
added.

Reviewed-by: Tony Hutter <hutter2@llnl.gov>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes openzfs#9041
Closes openzfs#9049

include/linux/simd_x86.h

@@ -84,6 +84,15 @@
 
 #if defined(_KERNEL)
 
+/*
+ * Disable the WARN_ON_FPU() macro to prevent additional dependencies
+ * when providing the kfpu_* functions.  Relevant warnings are included
+ * as appropriate and are unconditionally enabled.
+ */
+#if defined(CONFIG_X86_DEBUG_FPU) && !defined(KERNEL_EXPORTS_X86_FPU)
+#undef CONFIG_X86_DEBUG_FPU
+#endif
+
 #if defined(HAVE_KERNEL_FPU_API_HEADER)
 #include <asm/fpu/api.h>
 #include <asm/fpu/internal.h>