Removing references to APREQ_SOURCE_DIR and APREQ_BUILD_DIR

--- ./apreq2-config.in
+++ ./apreq2-config.in
@@ -33,9 +33,6 @@ LDFLAGS="@APR_LDFLAGS@"
 
 APREQ_LIBNAME="@APREQ_LIBNAME@"
 
-APREQ_SOURCE_DIR="@abs_srcdir@"
-APREQ_BUILD_DIR="@abs_builddir@"
-
 show_usage()
 {
     cat << EOF
@@ -48,7 +45,6 @@ Known values for OPTION are:
   --includedir      print location where headers are installed
   --ldflags         print linker flags
   --libs            print library information
-  --srcdir          print apreq2 source directory
   --link-ld         print link switch(es) for linking to libapreq2
   --link-libtool    print the libtool inputs for linking to libapreq2
   --la-file         print the path to the library's .la file, if available
@@ -83,17 +79,12 @@ fi
 # Otherwise, being in a symlinked dir may result in incorrect output.
 if test -x "`which realpath 2>/dev/null`"; then
     thisdir="`realpath $thisdir`"
-    if test -d "$APREQ_SOURCE_DIR"; then
-        APREQ_SOURCE_DIR="`realpath $APREQ_SOURCE_DIR`"
-    fi
     if test -n "$tmpbindir"; then
         tmpbindir="`realpath $tmpbindir`"
     fi
 fi
 if test "$tmpbindir" = "$thisdir"; then
     location=installed
-elif test "$APREQ_SOURCE_DIR" = "$thisdir"; then
-    location=source
 else
     location=build
 fi
@@ -133,11 +124,9 @@ while test $# -gt 0; do
     --includedir)
     if test "$location" = "installed"; then
         flags="$includedir"
-    elif test "$location" = "source"; then
-        flags="$APREQ_SOURCE_DIR/include"
     else
         # this is for VPATH builds
-        flags="$thisdir/include $APREQ_SOURCE_DIR/include"
+        flags="$thisdir/include"
     fi
     echo $flags
     exit 0
@@ -145,20 +134,14 @@ while test $# -gt 0; do
     --includes)
     if test "$location" = "installed"; then
         flags="$flags -I$includedir $INCLUDES"
-    elif test "$location" = "source"; then
-        flags="$flags -I$APREQ_SOURCE_DIR/include $INCLUDES"
     else
         # this is for VPATH builds
-        flags="$flags -I$thisdir/include -I$APREQ_SOURCE_DIR/include $INCLUDES"
+        flags="$flags -I$thisdir/include $INCLUDES"
     fi
     ;;
     --ldflags)
     flags="$flags $LDFLAGS"
     ;;
-    --srcdir)
-    echo $APREQ_SOURCE_DIR
-    exit 0
-    ;;
     --library-version)
     echo @APREQ_DOTTED_VERSION@
     exit 0