fix mpc's spkg-config.m4 to reject versions <1.2.1

Author: dimpase

build/pkgs/mpc/spkg-configure.m4

@@ -2,12 +2,13 @@ SAGE_SPKG_CONFIGURE([mpc], [
     SAGE_SPKG_DEPCHECK([mpfr], [
         dnl gmpy2 2.2 needs MPC >= 1.2.1 according https://github.com/aleaxit/gmpy/blob/master/src/gmpy2.h#L86
         AC_MSG_CHECKING([for MPC >= 1.2.1])
-        AC_LINK_IFELSE([AC_LANG_PROGRAM([[#include <mpc.h>]], [[
+        AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[#include <mpc.h>]], [[
 #if (!defined(MPC_VERSION) || (MPC_VERSION < MPC_VERSION_NUM(1,2,1)))
 #  error "Sage requires MPC 1.2.1 or later (for gmpy2 2.2)."
 #endif
         ]])], [
             AC_MSG_RESULT([yes])
+	    AC_SEARCH_LIBS([mpc_cmp_abs], [mpc], [], [sage_spkg_install_mpc=yes])
         ], [
             AC_MSG_RESULT([no])
             sage_spkg_install_mpc=yes