Merge branch 'tb-nonet' into 'master'

Disable libcurl when building without network support

See merge request STJr/SRB2!2182

src/Makefile.d/features.mk

@@ -18,6 +18,10 @@ opts+=-DHWRENDER
 sources+=$(call List,hardware/Sourcefile)
 endif
 
+ifdef NONET
+NOCURL=1
+endif
+
 ifndef NOMD5
 sources+=md5.c
 endif