new package: unshield

Requested in https://github.com/termux/termux-packages/issues/5086

packages/unshield/build.sh

@@ -0,0 +1,11 @@
+TERMUX_PKG_HOMEPAGE=https://github.com/twogood/unshield
+TERMUX_PKG_DESCRIPTION="Tool and library to extract CAB files from InstallShield installers"
+TERMUX_PKG_LICENSE="MIT"
+TERMUX_PKG_VERSION=1.4.3
+TERMUX_PKG_SRCURL=https://github.com/twogood/unshield/archive/1.4.3.tar.gz
+TERMUX_PKG_SHA256=aa8c978dc0eb1158d266eaddcd1852d6d71620ddfc82807fe4bf2e19022b7bab
+TERMUX_PKG_DEPENDS="libiconv, openssh, zlib"
+
+termux_step_pre_configure() {
+	LDFLAGS+=" -liconv"
+}