[Makefile] Add targets for build-pack and build-gba-player, update pkg-gba target to use them

Makefile

@@ -15,16 +15,26 @@ else
 endif
 
 .PHONY: pkg-gba
-pkg-gba: build
+pkg-gba: build-pack build-gba-player
 	${BC_CMD_ENVRUN} ${BC_PY3} deps/nostalgia/util/scripts/pkg-gba.py project ${BC_VAR_PROJECT_NAME_CAP}
 
 .PHONY: pkg-mac
 pkg-mac: install
 	${BC_CMD_ENVRUN} ${BC_PY3} deps/nostalgia/util/scripts/pkg-dmg.py JasperStudio
 
+.PHONY: build-gba-player
+build-gba-player:
+	cmake --build ./build/gba-*
+
 .PHONY: build-player
 build-player:
 	${BC_CMD_CMAKE_BUILD} ${BC_VAR_BUILD_PATH} ${BC_VAR_PROJECT_NAME_CAP}
+
+.PHONY: build-pack
+build-pack:
+	cmake --build ./build/${BC_VAR_CURRENT_BUILD} --target ${BC_VAR_PROJECT_NAME}-pack
+
+
 .PHONY: run
 run: build-player
 	${PROJECT_PLAYER} project