Switch to new download format and fix description

pkg.info

@@ -1,10 +1,19 @@
 name: mpc
-description: Minimalist command line interface to MPD
+description: Library for the arithmetic of complex numbers with arbitrarily high precision
 version: 1.3.1
-revision: 2
+revision: 3
 url: https://www.multiprecision.org/
 license: GPL2-or-later
+maintainers:
+  - [email protected]
 architecture: any
-depends: ["glibc","gmp","mpfr"]
-make_depends: ["bash","binutils","coreutils","diffutils","gawk","gcc","glibc","grep","gmp","make","mpfr","sed","texinfo"]
 type: source
+depends:
+  - glibc
+  - gmp
+  - mpfr
+downloads:
+  - url: https://ftpmirror.gnu.org/gnu/mpc/mpc-${BPM_PKG_VERSION}.tar.gz
+    extract_to: ${BPM_SOURCE}
+    extract_strip_components: 1
+    checksum: ab642492f5cf882b74aa0cb730cd410a81edcdbec895183ce930e706c1c759b8