Create folders when installing libraries

Apparently sometimes they don't exist.

CHANGELOG.md

@@ -2,6 +2,10 @@
 
 All notable changes to this project will be documented in this file.
 
+## [Unreleased][]
+
+- TODO
+
 ## [4.5.0][] - 2024-02-11
 
 - Fixed compatibility issues with devkitPPC release 39.
@@ -117,6 +121,7 @@ All notable changes to this project will be documented in this file.
 - New Bitmap FX
 - Add `GRRLIB_Exit()` to free the memory allocated by GRRLIB
 
+[unreleased]: https://github.com/GRRLIB/GRRLIB/compare/v4.5.0...HEAD
 [4.5.0]: https://github.com/GRRLIB/GRRLIB/compare/v4.4.1...v4.5.0
 [4.4.1]: https://github.com/GRRLIB/GRRLIB/compare/v4.4.0...v4.4.1
 [4.4.0]: https://github.com/GRRLIB/GRRLIB/compare/4.3.2...v4.4.0

GRRLIB/GRRLIB/Makefile

@@ -94,6 +94,7 @@ clean:
 
 #---------------------------------------------------------------------------------
 install:
+	@mkdir --parents $(DESTDIR)/lib $(DESTDIR)/include
 	@cp --force $(OUTPUT) $(DESTDIR)/lib
 	@cp --force --parents $(HDR) $(DESTDIR)/include