base-system-3: npth construye — nPth de GnuPG (libnpth.a)

b3:6d841c6a. Lib 1/3 de la cadena que faltaba para gnupg. Autotools limpio, fase configure explícita
--enable-static, sin deps.

recipes/incoming-clib/npth.toml

@@ -0,0 +1,30 @@
+# nPth 1.8 — New Portable Threads de GnuPG (una de las 3 libs para gnupg).
+# De-Alpinizada (Etapa G): autotools limpio de gnupg.org, sin deps de catálogo (autoconf/
+# automake/libtool NO hacen falta: el tarball release ya trae ./configure generado).
+name    = "npth"
+version = "1.8"
+
+[source]
+tarball = "https://gnupg.org/ftp/gcrypt/npth/npth-1.8.tar.bz2"
+# sha512 de Alpine (referencia):
+# 34fdeea3d8a7a594d8fdbcc6d5d389b5c8e282e8e84c1491b1e51960c0fa007df6a1d62543f0107f0772f3215557d4b25c2a9c7067cb0ae2f8de7b4d63d09fb4
+sha256  = "8bd24b4f23a3065d6e5b26e98aba9ce783ea4fd781069c1b35d149694e90ca3e"
+
+[build]
+compiler = "zig-cc"
+target   = "x86_64-linux-musl"
+link     = "static"
+flags    = []
+
+[build.phases]
+configure = '''
+./configure \
+	--build=$CBUILD \
+	--host=$CHOST \
+	--prefix=/usr \
+	--enable-static \
+	--disable-shared \
+	--disable-nls
+'''
+compile = 'make -j"$(nproc)"'
+install = 'make DESTDIR=/out install'