e2fsprogs: add packageconfig for -file-

Without a packageconfig dependency for the file utility, there's a rare compile faiure caused by a race where the magic.h header file is not found:

../../../git/lib/support/plausible.c:33:19: fatal error: magic.h: No such file or directory

This file, plausible.c, is part of libsupport.a which is used by many binaries produced by the e2fsprogs package. plausible.c attempts to dynamically load libmagic.so if the e2fsprogs configure detects that magic was available. Adding the packageconfig will eliminate the compile-time as well as the possible configure-time race condition.

---
 meta/recipes-devtools/e2fsprogs/e2fsprogs_1.43.bb | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

index f4855bc..0d7a42b 100644
@@ -22,7 +22,8 @@ EXTRA_OECONF += "--libdir=${base_libdir} --sbindir=${base_sbindir} \
 
 EXTRA_OECONF_darwin = "--libdir=${base_libdir} --sbindir=${base_sbindir} --enable-bsd-shlibs"
 
-PACKAGECONFIG ??= ""
+PACKAGECONFIG ??= "file"
+PACKAGECONFIG[file] = ',,file'
 PACKAGECONFIG[fuse] = '--enable-fuse2fs,--disable-fuse2fs,fuse'
 
 do_configure_prepend () {

1.9.1