internal/rosa/package: migrate many libraries

This also adds more string helpers.

Signed-off-by: Ophestra <cat@gensokyo.uk>

internal/rosa/package/libseccomp/package.az

@@ -0,0 +1,27 @@
+package libseccomp {
+	description = "an interface to the Linux Kernel's syscall filtering mechanism";
+	website = "https://github.com/seccomp/libseccomp";
+	anitya = 13823;
+
+	version* = "2.6.0";
+	source = remoteGitHubRelease {
+		suffix = "seccomp/libseccomp";
+		tag = "v"+version;
+		name = "libseccomp-"+version+".tar.gz";
+		checksum = "mMu-iR71guPjFbb31u-YexBaanKE_nYPjPux-vuBiPfS_0kbwJdfCGlkofaUm-EY";
+		compress = gzip;
+	};
+	patches = [ "fix-export-oob-read.patch" ];
+
+	early = "\nln -s ../system/bin/bash /bin/\n";
+
+	exec = make {};
+
+	inputs = [
+		bash,
+		diffutils,
+		gperf,
+
+		kernel-headers,
+	];
+}