cmake: add a preparatory work-around to accommodate `vcpkg`

We are about to add support for installing the `.dll` files of Git's
dependencies (such as libcurl) in the CMake configuration. The `vcpkg`
ecosystem from which we get said dependencies makes that relatively
easy: simply turn on `X_VCPKG_APPLOCAL_DEPS_INSTALL`.

However, current `vcpkg` introduces a limitation if one does that:
While it is totally cool with CMake to specify multiple targets within
one invocation of `install(TARGETS ...) (at least according to
https://cmake.org/cmake/help/latest/command/install.html#command:install),
`vcpkg`'s parser insists on a single target per `install(TARGETS ...)`
invocation.

Well, that's easily accomplished: Let's feed the targets individually to
the `install(TARGETS ...)` function in a `foreach()` look.

This also has the advantage that we do not have to manually cull off the
two entries from the `${PROGRAMS_BUILT}` array before scheduling the
remainder to be installed into `libexec/git-core`. Instead, we iterate
through the array and decide for each entry where it wants to go.

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

contrib/buildsystems/CMakeLists.txt

@@ -811,15 +811,19 @@ list(TRANSFORM git_shell_scripts PREPEND "${CMAKE_BINARY_DIR}/")
 list(TRANSFORM git_perl_scripts PREPEND "${CMAKE_BINARY_DIR}/")
 
 #install
-install(TARGETS git git-shell
+foreach(program ${PROGRAMS_BUILT})
+if(program STREQUAL "git" OR program STREQUAL "git-shell")
+install(TARGETS ${program}
 	RUNTIME DESTINATION bin)
+else()
+install(TARGETS ${program}
+	RUNTIME DESTINATION libexec/git-core)
+endif()
+endforeach()
+
 install(PROGRAMS ${CMAKE_BINARY_DIR}/git-cvsserver
 	DESTINATION bin)
 
-list(REMOVE_ITEM PROGRAMS_BUILT git git-shell)
-install(TARGETS ${PROGRAMS_BUILT}
-	RUNTIME DESTINATION libexec/git-core)
-
 set(bin_links
 	git-receive-pack git-upload-archive git-upload-pack)