meson: rename two more variables from _c to _sources

_c is misleading because .h files should be included in those lists too
(this tells meson that the build outputs should be rebuilt if the header
files change).

Follow-up for 1437822638.

src/libsystemd/meson.build

@@ -6,7 +6,7 @@ id128_sources = files('''
         sd-id128/sd-id128.c
 '''.split())
 
-sd_daemon_c = files('sd-daemon/sd-daemon.c')
+sd_daemon_sources = files('sd-daemon/sd-daemon.c')
 
 sd_event_sources = files('''
         sd-event/event-source.h
@@ -15,7 +15,7 @@ sd_event_sources = files('''
         sd-event/sd-event.c
 '''.split())
 
-sd_login_c = files('sd-login/sd-login.c')
+sd_login_sources = files('sd-login/sd-login.c')
 
 libsystemd_sources = files('''
         sd-bus/bus-common-errors.c
@@ -90,7 +90,7 @@ libsystemd_sources = files('''
         sd-path/sd-path.c
         sd-resolve/sd-resolve.c
         sd-utf8/sd-utf8.c
-'''.split()) + id128_sources + sd_daemon_c + sd_event_sources + sd_login_c
+'''.split()) + id128_sources + sd_daemon_sources + sd_event_sources + sd_login_sources
 
 disable_mempool_c = files('disable-mempool.c')
 

src/udev/meson.build

@@ -54,7 +54,7 @@ endif
 if conf.get('HAVE_ACL') == 1
         libudev_core_sources += ['udev-builtin-uaccess.c',
                                  logind_acl_c,
-                                 sd_login_c]
+                                 sd_login_sources]
 endif
 
 ############################################################