cmake: fall back to using `vcpkg`'s `msgfmt.exe` on Windows

We are already relying on `vcpkg` to manage our dependencies, including
`libiconv`. Let's also use the `msgfmt.exe` from there.

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
diff --git a/contrib/buildsystems/CMakeLists.txt b/contrib/buildsystems/CMakeLists.txt
index 12268f6..02241dc 100644
--- a/contrib/buildsystems/CMakeLists.txt
+++ b/contrib/buildsystems/CMakeLists.txt
@@ -152,7 +152,11 @@
 
 find_program(MSGFMT_EXE msgfmt)
 if(NOT MSGFMT_EXE)
-	message(WARNING "Text Translations won't be build")
+	set(MSGFMT_EXE ${CMAKE_SOURCE_DIR}/compat/vcbuild/vcpkg/downloads/tools/msys2/msys64/usr/bin/msgfmt.exe)
+	if(NOT EXISTS ${MSGFMT_EXE})
+		message(WARNING "Text Translations won't be built")
+		unset(MSGFMT_EXE)
+	endif()
 endif()
 
 #Force all visual studio outputs to CMAKE_BINARY_DIR