CI Windows: updated Spout build

the CMakeList.txt in upstream changed build location

+ print missing items in configure.ac

Author: MartinPulec

.github/scripts/Windows/install_spout.sh

@@ -7,13 +7,14 @@ build() {(
         git clone --depth 1 https://github.com/leadedge/Spout2.git
         cd Spout2
         /c/Program\ Files/CMake/bin/cmake.exe -Bbuild2 . # ./BUILD already exists
-        /c/Program\ Files/CMake/bin/cmake.exe --build build2 -j "$(nproc)"
+        /c/Program\ Files/CMake/bin/cmake.exe --build build2 --config Release \
+         -j "$(nproc)"
 )}
 
 install() {(
         mkdir -p /usr/local/bin /usr/local/include /usr/local/lib
-        cp /c/Spout2/build2/Binaries/x64/SpoutLibrary.dll /usr/local/bin/
-        cp /c/Spout2/build2/Binaries/x64/SpoutLibrary.lib /usr/local/lib/
+        cp /c/Spout2/build2/bin/Release/SpoutLibrary.dll /usr/local/bin/
+        cp /c/Spout2/build2/lib/Release/SpoutLibrary.lib /usr/local/lib/
         cp /c/Spout2/SPOUTSDK/SpoutLibrary/SpoutLibrary.h /usr/local/include/
 )}
 

configure.ac

@@ -3034,6 +3034,7 @@ AC_ARG_ENABLE(spout,
     )
 
 FOUND_SPOUT=no
+missing_item="OpenGL"
 if test $system = Windows && test "$spout_req" != no && test "$OPENGL" = yes
 then
         AC_LANG_PUSH([C++])
@@ -3043,6 +3044,7 @@ then
                        [[auto *spout = GetSpout();]])],
                        FOUND_SPOUT=yes, FOUND_SPOUT=no)
         LIBS=$SAVED_LIBS
+        missing_item="SpoutLibrary.h"
         AC_LANG_POP([C++])
 fi
 
@@ -3053,7 +3055,7 @@ then
         spout=yes
 fi
 
-ENSURE_FEATURE_PRESENT([$spout_req], [$spout], [Could not found Spout dependencies!])
+ENSURE_FEATURE_PRESENT([$spout_req], [$spout], [Could not found Spout dependencies: ${missing_item?}])
 
 # -------------------------------------------------------------------------------------------------
 # MCU-like video mixer