[GITHUB] Remove VS 2015 build from the CI (reactos#3872)

[WORKFLOWS] Remove some excludes as well

.github/workflows/build.yml

@@ -84,24 +84,14 @@ jobs:
   build-msvc:
     strategy:
       matrix:
-        os: [windows-latest, windows-2019]
-        toolset: ['14.2', '14.1', '14.0'] # VS 2019, 2017, and 2015 (see below)
+        os: [windows-latest]
+        toolset: ['14.2', '14.1'] # VS 2019, and 2017 (see below)
         arch: [i386, amd64]
         config: [Debug, Release]
         dllver: ['0x502', '0x600']
-        exclude: # VS 2019, 2017 only with windows-latest; VS 2015 only with windows-2019
-          - os: windows-2019
-            toolset: '14.2'
-          - os: windows-2019
-            toolset: '14.1'
-          - os: windows-latest
-            toolset: '14.0'
-          - dllver: 0x600
-            os: windows-2019
+        exclude: # VS 2019, 2017 only with windows-latest
           - dllver: 0x600
             toolset: '14.1'
-          - dllver: 0x600
-            toolset: '14.0'
           - dllver: 0x600
             config: Release
       fail-fast: false

README.md

@@ -56,7 +56,7 @@ The code of ReactOS is licensed under [GNU GPL 2.0](https://github.com/reactos/r
 To build the system it is strongly advised to use the _ReactOS Build Environment (RosBE)._
 Up-to-date versions for Windows and for Unix/GNU-Linux are available from our download page at: ["Build Environment"](https://reactos.org/wiki/Build_Environment).
 
-Alternatively one can use Microsoft Visual C++ (MSVC) version 2015+. Building with MSVC is covered here: ["Visual Studio or Microsoft Visual C++"](https://reactos.org/wiki/CMake#Visual_Studio_or_Microsoft_Visual_C.2B.2B).
+Alternatively one can use Microsoft Visual C++ (MSVC) version 2019+. Building with MSVC is covered here: ["Visual Studio or Microsoft Visual C++"](https://reactos.org/wiki/CMake#Visual_Studio_or_Microsoft_Visual_C.2B.2B).
 
 See ["Building ReactOS"](https://reactos.org/wiki/Building_ReactOS) article for more details.