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Document version string fallback in Makefile

For a packager just looking at the Makefile, it's not obvious that there
is one...

--- a/Makefile

+++ b/Makefile

@@ -27,6 +27,7 @@

 PNGLDFLAGS	:= `${PKG_CONFIG} --libs-only-L libpng`

 PNGLDLIBS	:= `${PKG_CONFIG} --libs-only-l libpng`

+# Note: if this comes up empty, `version.c` will automatically fall back to last release number

 VERSION_STRING	:= `git describe --tags --dirty --always 2>/dev/null`

 WARNFLAGS	:= -Wall