Link against libgcc to avoid unresolved symbols
    
    We need to link agaisnt -lgcc, on at least hppa, PPC and ARC.
    That's because in some corner-cases like compilation with -Os
    on ARC and PPC so-called millicode (basically function prologue and
    epilogue) implemented in libgcc.a is used. So we end up with
    GLOBAL UNDEFINED symbol in libaio.so and then on linkage of the final
    applicaiton LD fails to proceed saying:
    --------------------------->8----------------------
    hidden symbol '__ld_r13_to_r15_ret' in .../libgcc.a(_millicodethunk_ret.o) is referenced by DSO
    --------------------------->8----------------------
    
    Also it looks like in general it is not the best idea to use either
    "-nostartfiles" or "-nostdlib" when linking shared libs because
    default construtor/destructor functions won't be executed, see
    "5.2. Library constructor and destructor functions" in [1]
    
    So let's stop passing "-nostdlib" and "-nostartfiles" and get required
    stuff built-in libaio.
    
    Initial patch taken from Debian [2].
    
    Fixes build failures in Buildroot like blktrace [3], lvm2 [4].
    
    [1] http://tldp.org/HOWTO/Program-Library-HOWTO/miscellaneous.html
    [2] https://sources.debian.org/patches/libaio/0.3.111-1/01_link_libs.patch/
    [3] http://autobuild.buildroot.net/results/17461209755038a30118d76acb4f43469a22a139/
    [4] http://autobuild.buildroot.net/results/a5dfc87f94b97135e5cc84f6a876114891ed9dd9/
    
    Signed-off-by: Guillem Jover <guillem@debian.org>
    Signed-off-by: Alexey Brodkin <abrodkin@synopsys.com>