package/elfutils: drop lfs tweak

When the elfutils package was first introduced, it filtered out
LFS-related compiler flags due to issues with the package's
implementation. This package has since evolved over the years to support
LFS (e.g. using `AC_SYS_LARGEFILE` [1]).

Filtering out `-D_FILE_OFFSET_BITS=64` can lead to a configuration error
when `BR2_TIME_BITS_64` is enabled:

    checking whether gcc supports -Wl,-z,relro... yes
    checking for __thread support... no
    configure: error: __thread support required
    ...

With the configuration log providing the specific reason:

    configure:7175: .../output-1/host/bin/m68k-buildroot-linux-gnu-gcc -o conftest -fPIC -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_TIME_BITS=64 -Ofast -g0 -D_FORTIFY_SOURCE=2 -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_TIME_BITS=64 -shared -Wl,-z,defs -Wl,-z,relro   -latomic -Wl,--build-id conftest.c  >&5
    In file included from .../output-1/host/m68k-buildroot-linux-gnu/sysroot/usr/include/features.h:394,
                     from .../output-1/host/m68k-buildroot-linux-gnu/sysroot/usr/include/bits/libc-header-start.h:33,
                     from .../output-1/host/m68k-buildroot-linux-gnu/sysroot/usr/include/stdlib.h:26,
                     from conftest.c:13:
    .../output-1/host/m68k-buildroot-linux-gnu/sysroot/usr/include/features-time64.h:26:5: error: #error "_TIME_BITS=64 is allowed only with _FILE_OFFSET_BITS=64"
       26 | #   error "_TIME_BITS=64 is allowed only with _FILE_OFFSET_BITS=64"
          |     ^~~~~
    configure:7175: $? = 1
    ...

Fixes:
 - http://autobuild.buildroot.org/results/fbfe131673ed78999a07dbc879436e0ef6a8a1c0

[1]: https://sourceware.org/git/?p=elfutils.git;a=commit;h=3425454a10d307fae891fb667cf7969e945cde79

Signed-off-by: James Knight <james.d.knight@live.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

package/elfutils/elfutils.mk

@@ -29,10 +29,6 @@ HOST_ELFUTILS_CONF_OPTS = \
 	--without-zstd \
 	--disable-progs
 
-# elfutils gets confused when lfs mode is forced, so don't
-ELFUTILS_CFLAGS = $(filter-out -D_FILE_OFFSET_BITS=64,$(TARGET_CFLAGS))
-ELFUTILS_CPPFLAGS = $(filter-out -D_FILE_OFFSET_BITS=64,$(TARGET_CPPFLAGS))
-
 ELFUTILS_CONF_ENV += \
 	CFLAGS="$(ELFUTILS_CFLAGS)" \
 	CPPFLAGS="$(ELFUTILS_CPPFLAGS)"