Install UCRT from MSUs, not using nested VC Redist install

Using nested install is bad because (1) MS advises against it (though it
most possibly doesn't relate to our specific case, when we install the
vc redist exe package in UI part, so actually only a single MSI session
is active at any time); (2) because it adds some extra interactions
(user sees something "unrelated" being installed, which raises concerns;
additional admin authentication required); and (3) because it runs in
InstallUISequence, thus only installing the UCRT when doing interactive
installation (unattended installs, including GPO, need to install UCRT
separately).

This patch aims to incorporate the original UCRT MSU (Windows Update)
packages (https://support.microsoft.com/en-us/help/2999226) available as
a zip archive from
https://www.microsoft.com/en-us/download/details.aspx?id=48234
- the same as used in VC redists for VS 2015 and 2017. This obsoletes
the separate installation of the redist; since we also have the redist
as merge module in our MSI, that is enough (and removes redundancy).
The MSUs are installed using wusa.exe in a custom action (deferred,
non-impersonating).

As a small bonus, embedding MSUs instead of redist EXE allows us to
shrink the size of installer a little (~10 MB).

As deferred custom actions cannot access current installer database,
we workaround this by using initial immediate impersonating action to
extract the binaries into a temporary location. To ensure that the file
gets removed upon completion (both successful and failed), we use an
additional cleanup action.

Commit 61b1d631331551b43bc7d619be33bfbfeff7cad6 is effectively reverted.

This commit also includes changes from commits from master:
8faa1bc61fa8f09365d483364aea2b1c2751b587
1f8a3657216e44796cb94087450552aa977ebdae
378c1576d2890625ebbd18ec9ccff560eeb1619f

Change-Id: I1529356fdcc67ff24b232c01ddf8bb3a31bb00bd
Reviewed-on: https://gerrit.libreoffice.org/53332
Reviewed-by: Andras Timar <andras.timar@collabora.com>
Tested-by: Andras Timar <andras.timar@collabora.com>

1 files changed, 0 insertions, 1 deletions

diff --git a/config_host.mk.in b/config_host.mk.in
index c74a097b937b..2dc4e1ba7ed3 100644
--- a/config_host.mk.in
+++ b/config_host.mk.in
@@ -576,7 +576,6 @@ export TOUCH=@TOUCH@
 export UCRTSDKDIR=@UCRTSDKDIR@
 export UCRTVERSION=@UCRTVERSION@
 export UCRT_REDISTDIR=@UCRT_REDISTDIR@
-export UCRT_DLLS=@UCRT_DLLS@
 export UNOWINREG_DLL=@UNOWINREG_DLL@
 export USE_LIBRARY_BIN_TAR=@USE_LIBRARY_BIN_TAR@
 export USE_XINERAMA=@USE_XINERAMA@