arm64: Enforce PIC build of kernel

Signed-off-by: Jaroslaw Pelczar <jarek@jpelczar.com>
Change-Id: I4d4acf91865b182d9fd5f500978705854e0638e5
Reviewed-on: https://review.haiku-os.org/c/haiku/+/1855
Reviewed-by: Adrien Destugues <pulkomandy@gmail.com>

build/jam/ArchitectureRules

@@ -429,6 +429,9 @@ rule KernelArchitectureSetup architecture
 				-Wl,-z -Wl,max-page-size=0x1000
 				-Wl,-z -Wl,common-page-size=0x1000 ;
 
+			HAIKU_KERNEL_PIC_CCFLAGS = -fPIC ;
+			HAIKU_KERNEL_PIC_LINKFLAGS = -shared -fPIC ;
+
 		case ppc :
 			# Build a position independent PPC kernel. We need to be able to
 			# relocate the kernel, since the virtual address space layout at