testing/icewm: LTO now compiles

and produces a smaller /usr/bin/icewm

testing/icewm/APKBUILD

@@ -41,8 +41,8 @@ build() {
 		-DCMAKE_BUILD_TYPE=None \
 		-DCMAKE_INSTALL_PREFIX=/usr \
 		-DCFGDIR=/etc \
-		-DENABLE_LTO=OFF \
 		-DENABLE_NLS=OFF \
+		-DENABLE_LTO=ON \
 		-DDOCDIR=/usr/share/doc/icewm $_arch_opts
 	cmake --build build
 }