shithub: rgbds

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Fix the name of the GNUmakefile

GNU make actually looks for ‘GNUmakefile’, not ‘GNUMakefile’.

Consequently, GNU make would erroneously attempt to use the standard
makefile, instead of the GNU-specific one. This would cause an error
when attempting to import png.h, due to PNGFLAGS not being correctly
set.

--- a/GNUMakefile

+++ /dev/null

@@ -1,6 +1,0 @@

-# GNU Make 3.x doesn't support the "!=" shell syntax, so here's an alternative

-

-PKG_CONFIG = pkg-config

-PNGFLAGS = $(shell ${PKG_CONFIG} --cflags libpng)

-

-include Makefile

--- /dev/null

+++ b/GNUmakefile

@@ -1,0 +1,6 @@

+# GNU Make 3.x doesn't support the "!=" shell syntax, so here's an alternative

+

+PKG_CONFIG = pkg-config

+PNGFLAGS = $(shell ${PKG_CONFIG} --cflags libpng)

+

+include Makefile