LibC+libtool: libstdc++ compiled into libc not detected by libtool

[fdellwing]

pdfinfo (and all other poppler-utils) currently crash horrible if the gpgme dependency is compiled in:

36.736 [#0 pdfinfo(45:45)]: Terminating pdfinfo(45) due to signal 6
36.743 [#0 Finalizer Task(5:5)]: Backtrace:
0x00000000deadc0de  Kernel::ProcessorBase<Kernel::Processor>::switch_context(Kernel::Thread*&, Kernel::Thread*&) + 0x3be
0x00000000deadc0de  Kernel::Scheduler::context_switch(Kernel::Thread*) + 0x20a
0x00000000deadc0de  Kernel::Scheduler::pick_next() + 0x173
0x00000000deadc0de  Kernel::ProcessorBase<Kernel::Processor>::clear_critical() + 0x11e
0x00000000deadc0de  Kernel::Thread::die_if_needed() + 0x322
0x00000000deadc0de  syscall_handler + 0x1461
0x00000000deadc0de  syscall_entry + 0x51
0x000000006d82d3de  /usr/lib/libc.so: .text + 0x3de
0x000000006d833e30  /usr/lib/libc.so: .text + 0x6e30
0x000000006d839a9c  /usr/lib/libc.so: .text + 0xca9c
0x0000001d35b8755d  /usr/local/bin/pdfinfo: .text + 0xd55d
0x0000001d35b87724  /usr/local/bin/pdfinfo: .text + 0xd724
0x0000001d35c1547c  /usr/local/bin/pdfinfo: .text + 0x9b47c
0x0000001d35bc4952  /usr/local/bin/pdfinfo: .text + 0x4a952
0x0000000d25210bae  /usr/local/lib/libgpgmepp.so.6: .text + 0xcebae
0x0000000d251ddb98  /usr/local/lib/libgpgmepp.so.6: .text + 0x9bb98
0x000000000d5070c5  /usr/lib/Loader.so + 0x5f0c5
0x000000000d507101  /usr/lib/Loader.so + 0x5f101
0x000000000d500089  /usr/lib/Loader.so + 0x58089
0x000000000d501c45  /usr/lib/Loader.so + 0x59c45
0x000000000d4ad3d3  /usr/lib/Loader.so + 0x53d3

40.889 CrashReporter(46:47): --- Backtrace for thread #0 (TID 45) ---
40.895 CrashReporter(46:47): 0x000000126549802b: [/usr/lib/libsystem.so] syscall2 +0xb (syscall.cpp:25 => syscall.cpp:24)
40.900 CrashReporter(46:47): 0x000000006d82d3dd: [/usr/lib/libc.so] abort +0x26 (stdlib.cpp:387)
40.904 CrashReporter(46:47): 0x000000006d833e2f: [/usr/lib/libc.so] __assertion_failed +0x7f (assert.cpp:34)
40.908 CrashReporter(46:47): 0x000000006d839a9b: [/usr/lib/libc.so] free.localalias +0x4ab (malloc.cpp:489 => malloc.cpp:563)
40.925 CrashReporter(46:47): 0x0000001d35b8755c: [/usr/local/bin/pdfinfo] std::locale::_Impl::~_Impl() +0x8c ()
40.929 CrashReporter(46:47): 0x0000001d35b87723: [/usr/local/bin/pdfinfo] std::locale::operator=(std::locale const&) +0x93 (locale_classes.h:574 => locale.cc:124)
40.935 CrashReporter(46:47): 0x0000001d35c1547b: [/usr/local/bin/pdfinfo] std::ios_base::_M_init() +0x3b ()
40.939 CrashReporter(46:47): 0x0000001d35bc4951: [/usr/local/bin/pdfinfo] std::basic_ios<char, std::char_traits<char> >::init(std::basic_streambuf<char, std::char_traits<char> >*) +0x11 ()
40.946 CrashReporter(46:47): 0x0000000d25210bad: [/usr/local/lib/libgpgmepp.so.6] std::ios_base::Init::Init() [clone .part.0] +0x29d (ios_init.cc:92)
40.951 CrashReporter(46:47): 0x0000000d251ddb97: [/usr/local/lib/libgpgmepp.so.6] _GLOBAL__sub_I.00090_globals_io.cc +0x17 (swdbresult.h:39 => globals_io.cc:109)

There are speculations in Discord that the reason is some conflict with libstdc++.a being compiled statically into gpgme even though it should be provided by our LibC.

https://discord.com/channels/830522505605283862/830807158047244329/1213232482896580618