Allow make vcxproj without initializing vcpkg

The idea of the `vcxproj` target is to generate .sln/.vcxproj files and
then commit them, to be used elsewhere. Typically, this is done in a
VSTS job whenever `master` changes. So there is little use in
initializing vcpkg and building all the dependencies: they are not
necessary here.

Signed-off-by: Johannes Schindelin <[email protected]>

Author: dscho

config.mak.uname

@@ -25,10 +25,12 @@ include compat/vcbuild/MSVC-DEFS-GEN
 	# See if vcpkg and the vcpkg-build versions of the third-party
 	# libraries that we use are installed.  We include the result
 	# to get $(vcpkg_*) variables defined for the Makefile.
+ifeq (,$(SKIP_VCPKG))
 compat/vcbuild/VCPKG-DEFS: compat/vcbuild/vcpkg_install.bat
 	@"$<"
 include compat/vcbuild/VCPKG-DEFS
 endif
+endif
 
 # We choose to avoid "if .. else if .. else .. endif endif"
 # because maintaining the nesting to match is a pain.  If

contrib/buildsystems/engine.pl

@@ -82,7 +82,8 @@ sub showUsage
 # Capture the make dry stderr to file for review (will be empty for a release build).
 
 my $ErrsFile = "msvc-build-makedryerrors.txt";
-@makedry = `make -C $git_dir -n MSVC=1 V=1 2>$ErrsFile` if !@makedry;
+@makedry = `make -C $git_dir -n MSVC=1 SKIP_VCPKG=1 V=1 2>$ErrsFile`
+if !@makedry;
 # test for an empty Errors file and remove it
 unlink $ErrsFile if -f -z $ErrsFile;