Fix path generation so generations in subdirs work.

ninjabackend.py

@@ -1696,7 +1696,7 @@ rule FORTRAN_DEP_HACK
                 continue
             for f in t.output:
                 if self.environment.is_library(f):
-                    libs.append(os.path.join(self.get_target_dir(target), f))
+                    libs.append(os.path.join(self.get_target_dir(t), f))
         return libs
 
     def determine_rpath_dirs(self, target):

test cases/common/103 manygen/meson.build

@@ -1,12 +1,6 @@
 project('manygen', 'c')
 
-gen = find_program('manygen.py')
-
-generated = custom_target('manygen',
-  output : ['gen_func.a', 'gen_func.c', 'gen_func.h', 'gen_func.o'],
-  input : ['funcinfo.def'],
-  command : [gen, '@INPUT@', '@OUTDIR@'],
-)
+subdir('subdir')
 
 exe = executable('depuser', 'depuser.c',
   generated)

test cases/common/103 manygen/subdir/meson.build

@@ -0,0 +1,7 @@
+gen = find_program('manygen.py')
+
+generated = custom_target('manygen',
+  output : ['gen_func.a', 'gen_func.c', 'gen_func.h', 'gen_func.o'],
+  input : ['funcinfo.def'],
+  command : [gen, '@INPUT@', '@OUTDIR@'],
+)