tests/lcitool: Remove g++ from the containers (except for the MinGW one)

We don't need C++ for the normal QEMU builds anymore, so installing
g++ in each and every container seems to be a waste of time and disk
space. The only container that still needs it is the Fedora MinGW
container that builds the only remaining C++ code in ./qga/vss-win32/
and we can install it there with an extra project yml file instead.

Message-ID: <20240516084059.511463-4-thuth@redhat.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>

tests/lcitool/projects/qemu-minimal.yml

@@ -7,7 +7,6 @@ packages:
  - ccache
  - findutils
  - flex
- - g++
  - gcc
  - gcc-native
  - glib2

tests/lcitool/projects/qemu-win-installer.yml

@@ -0,0 +1,4 @@
+# Additional packages that are required to build the code in qga/vss-win32/
+---
+packages:
+ - g++

tests/lcitool/projects/qemu.yml

@@ -22,7 +22,6 @@ packages:
  - findutils
  - flex
  - fuse3
- - g++
  - gcc
  - gcc-native
  - gcovr

tests/lcitool/refresh

@@ -192,6 +192,7 @@ try:
                                             "s390x-softmmu,s390x-linux-user"))
 
     generate_dockerfile("fedora-win64-cross", "fedora-38",
+                        project='qemu,qemu-win-installer',
                         cross="mingw64",
                         trailer=cross_build("x86_64-w64-mingw32-",
                                             "x86_64-softmmu"))