[meson] Don’t tamper with paths in amalgam files

Using os.path.basename() breaks files in subdirectories
(gsubgpos-graph.cc instead of graph/gsubgpos-graph.cc).

Use paths relative to current source dir instead.

src/gen-harfbuzzcc.py

@@ -14,7 +14,7 @@ CURRENT_SOURCE_DIR = sys.argv[2]
 sources = sorted(set(sys.argv[3:]))
 
 with open (OUTPUT, "wb") as f:
-	f.write ("".join ('#include "{}"\n'.format (os.path.basename (x)) for x in sources if x.endswith (".cc")).encode ())
+	f.write ("".join ('#include "{}"\n'.format (os.path.relpath (os.path.abspath (x), CURRENT_SOURCE_DIR)) for x in sources if x.endswith (".cc")).encode ())
 
 # copy it also to the source tree, but only if it has changed
 baseline_filename = os.path.join (CURRENT_SOURCE_DIR, os.path.basename (OUTPUT))

src/harfbuzz-subset.cc

@@ -1,4 +1,4 @@
-#include "gsubgpos-graph.cc"
+#include "graph/gsubgpos-graph.cc"
 #include "hb-aat-layout.cc"
 #include "hb-aat-map.cc"
 #include "hb-blob.cc"