[PATCH 4/6] msvc: do handle builds on Windows/ARM64

["Johannes Schindelin via GitGitGadget" <gitgitgadget@gmail.com>]

From: Johannes Schindelin <johannes.schindelin@gmx.de>

Git for Windows/ARM64 settled on using `clang` to compile `git.exe`, and
hence needs to run in a system where `MSYSTEM` is set to `CLANGARM64`
and the prefix to use is `/clangarm64`.

We already did that in the `MINGW` arm, i.e. for regular Git for Windows
builds using MINGW GCC (or `clang`'s shim pretending to be GCC), now it
is time to do the same in the MS Visual C part.

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
---
 config.mak.uname | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/config.mak.uname b/config.mak.uname
index 6222d2c5a48..bd94f458088 100644
--- a/config.mak.uname
+++ b/config.mak.uname
@@ -432,7 +432,11 @@ ifeq ($(uname_S),Windows)
         ifeq (MINGW32,$(MSYSTEM))
 		prefix = /mingw32
         else
-		prefix = /mingw64
+		ifeq (CLANGARM64,$(MSYSTEM))
+			prefix = /clangarm64
+		else
+			prefix = /mingw64
+		endif
         endif
 	# Prepend MSVC 64-bit tool-chain to PATH.
 	#
-- 
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