Display link command line when building for windows

Command line is limited in length on windows so meson/ninja puts it in a response file and passes that to the linker instead. Only problem is, ninja -v displays only the part of the command line where it tells link.exe where the response file is, not what's in the response file. So I just had the script print it. Care must also be taken for the script to properly fail if ninja fails, but not before the command line is printed.

Also add /GL and /LCTG to msvc command lines because they can't hurt. Right?

.github/build.sh

@@ -276,7 +276,16 @@ ANDROID_INI
 fi
 $meson_configure build
 cd build
-ninja -v
+if [[ $BSH_BUILD_PLATFORM == windows ]]; then
+	set +e
+	ninja -v -d keeprsp
+	ninja_code=$?
+	set -e
+	cat powder.exe.rsp
+	[[ $ninja_code == 0 ]];
+else
+	ninja -v
+fi
 strip=strip
 objcopy=objcopy
 strip_target=$ASSET_PATH

meson.build

@@ -182,10 +182,12 @@ if is_msvc
 		args_msvc += [
 			'/Oy-',
 			'/fp:fast',
+			'/GL',
 		]
 		project_link_args += [
 			'/OPT:REF',
 			'/OPT:ICF',
+			'/LTCG',
 		]
 	endif
 	project_c_args += args_msvc