aarch64: vvc: Fix building the dmvr_hv assembly with older MSVC versions

Explicitly use ldur for unaligned offsets; newer versions of
armasm64 implicitly convert ldr to ldur as necessary, but older
versions require it explicitly written out.

This fixes these build errors:

    ffmpeg\libavcodec\aarch64\vvc\inter.o.asm(2039) :
     error A2518: operand 2: Memory offset must be aligned
            ldr             s5, [x1, #1]
    ffmpeg\libavcodec\aarch64\vvc\inter.o.asm(2250) :
     error A2518: operand 2: Memory offset must be aligned
            ldr             d7, [x1, ffvvc#2]

Signed-off-by: Martin Storsjö <[email protected]>

libavcodec/aarch64/vvc/inter.S

@@ -411,7 +411,7 @@ function ff_vvc_dmvr_hv_8_neon, export=1
         ushr            v16.8h, v16.8h, #4
         str             q16, [x14], #16
 3:
-        ldr             s5, [src, #1]
+        ldur            s5, [src, #1]
         ldr             s4, [src], #4
         uxtl            v7.8h, v5.8b
         uxtl            v6.8h, v4.8b
@@ -572,7 +572,7 @@ function ff_vvc_dmvr_hv_10_neon, export=1
         uqxtn2          v16.8h, v18.4s
         str             q16, [x14], #16
 3:
-        ldr             d7, [src, #2]
+        ldur            d7, [src, #2]
         ldr             d6, [src], #8
         umull           v4.4s, v7.4h, v1.4h
         umlal           v4.4s, v6.4h, v0.4h