Remove unnecessary library flags from output of aalib-config --libs that cause
other projects that use aalib to be overlinked.

https://src.fedoraproject.org/rpms/aalib/blob/rawhide/f/aalib-1.4rc5-libflag.patch
--- aalib-config.in.orig	2008-03-24 20:42:47.000000000 -0700
+++ aalib-config.in	2008-03-24 20:44:24.000000000 -0700
@@ -49,12 +49,12 @@ while test $# -gt 0; do
       ;;
 @ENABLE_SHARED_TRUE@    --libs)
 @ENABLE_SHARED_TRUE@      libdirs="-L@libdir@ @AALIB_RLD_FLAGS@"
-@ENABLE_SHARED_TRUE@      echo $libdirs @AALIB_LIBS@
+@ENABLE_SHARED_TRUE@      echo $libdirs -laa
 @ENABLE_SHARED_TRUE@      ;;
 @ENABLE_STATIC_TRUE@@ENABLE_SHARED_TRUE@    --static-libs)
 @ENABLE_STATIC_TRUE@@ENABLE_SHARED_FALSE@    --libs|--static-libs)
 @ENABLE_STATIC_TRUE@      libdirs="-L@libdir@ @AALIB_RLD_FLAGS@"
-@ENABLE_STATIC_TRUE@      echo $libdirs @AALIB_LIBS@ 
+@ENABLE_STATIC_TRUE@      echo $libdirs -laa
 @ENABLE_STATIC_TRUE@      ;;
     *)
       echo "${usage}" 1>&2