Gracefully handle packages breaking because of soname bumps (#1116)

Fixes #893. Changes:
* New action: "pmbootstrap pkgrel_bump"
* pmbootstrap detects missing soname depends when trying to install
  anyting, and suggests "pkgrel_bump --auto" to fix it
* Testcase test_soname_bump.py checks the pmOS binary package repo
  for soname breakage, so we see it when CI runs for new PRs
* libsamsung-ipc: bump pkgrel because of soname bump

test/testdata/pkgrel_bump/aports/testapp/APKBUILD

@@ -0,0 +1,29 @@
+pkgname=testapp
+pkgver=1.0
+pkgrel=0
+pkgdesc="program using the testlib (for testing soname bumps)"
+url="https://postmarketos.org"
+arch="all"
+license="MIT"
+depends="testlib"
+makedepends=""
+subpackages=""
+source="testapp.c"
+options=""
+
+build() {
+	cd "$srcdir"
+	$CC testapp.c -o testapp -L/usr/lib/ -ltestlib
+}
+
+check() {
+	cd "$srcdir"
+	printf 'hello, world from testlib!\n' > expected
+	./testapp > real
+	diff -q expected real
+}
+
+package() {
+	install -Dm755 "$srcdir/testapp" "$pkgdir/usr/bin/testapp"
+}
+sha512sums="73b167575dc0082a1277b0430f095509885c7aaf55e59bad148825a9879f91fe41c6479bb7f34c0cdd15284b0aadd904a5ba2c1ea85fb8bfb061e1cbf4322d76  testapp.c"

test/testdata/pkgrel_bump/aports/testapp/testapp.c

@@ -0,0 +1,7 @@
+#include <stdio.h>
+#include <testlib.h>
+
+int main(int argc, char **argv) {
+    testlib_hello();
+    return 0;
+}

test/testdata/pkgrel_bump/aports/testlib/APKBUILD

@@ -0,0 +1,38 @@
+pkgname=testlib
+pkgver=1.0
+pkgrel=0
+pkgdesc="testing soname bumps (soname changes with pkgrel!)"
+url="https://postmarketos.org"
+arch="all"
+license="MIT"
+depends=""
+makedepends=""
+subpackages=""
+source="testlib.c testlib.h"
+options="!check"
+
+build() {
+	cd "$srcdir"
+	local major="$pkgrel"
+	local minor="0"
+	local soname="libtestlib.so.$major"
+	local realname="libtestlib.so.$minor.$major"
+
+	$CC -fPIC -c -g -Wall testlib.c -o libtestlib.o
+	$CC -shared -Wl,-soname,$soname -o $realname libtestlib.o
+	ln -sf $realname $soname
+	ln -sf $soname "libtestlib.so"
+}
+
+package() {
+	cd "$srcdir"
+	install -Dm755 testlib.h "$pkgdir/usr/include/testlib.h"
+
+	mkdir -p "$pkgdir/usr/lib/"
+	local i
+	for i in *.so*; do
+		cp -a "$i" "$pkgdir/usr/lib/$i"
+	done
+}
+sha512sums="15c671462a2f043e798b2998e8706f3ac119648c3d3ae946a0115c1f1aec567537f44e7e778bc77d3af4cd05a2d684677dabd56bb35799fca5939c6c087b4e27  testlib.c
+16be61567995052e20f9436c6834c2ca2afcfb04fea15c5d02eb576ecfdc9ef4fed8d977468b2564bbe934d098d111837d96cc323dae3f4dd033aa1d061063ee  testlib.h"

test/testdata/pkgrel_bump/aports/testlib/testlib.c

@@ -0,0 +1,5 @@
+#include <stdio.h>
+
+void testlib_hello() {
+	printf("hello, world from testlib!\n");
+}

test/testdata/pkgrel_bump/aports/testlib/testlib.h

@@ -0,0 +1,3 @@
+#pragma once
+
+void testlib_hello();