Set install_name to full path on OSX

When building and installing to a non-standard directory on OSX (for
example: when testing multiple versions of CK) it is desirable for
clients of CK to have the install_name match the installed location,
otherwise they need to resort to setting DYLD_LIBRARY_PATH to pick up
the library.

configure

@@ -531,15 +531,17 @@ if test "$COMPILER" = "suncc"; then
 	PTHREAD_CFLAGS="-mt -lpthread"
 elif test "$COMPILER" = "gcc" || test "$COMPILER" = "clang" || test "$COMPILER" = "mingw32" || test "$COMPILER" = "mingw64"; then
 	LD=$CC
+	SONAME="$LDNAME_MAJOR"
 	if test "$SYSTEM" = "darwin"; then
 		CC_WL_OPT="-install_name"
 		LDNAME="libck.dylib"
 		LDNAME_VERSION="libck.$VERSION.dylib"
 		LDNAME_MAJOR="libck.$VERSION_MAJOR.dylib"
+		SONAME="$LIBRARY/$LDNAME_MAJOR"
 	else
 		CC_WL_OPT="-soname"
 	fi
-	LDFLAGS="-shared -fPIC -Wl,$CC_WL_OPT,$LDNAME_MAJOR $LDFLAGS"
+	LDFLAGS="-shared -fPIC -Wl,$CC_WL_OPT,$SONAME $LDFLAGS"
 	CFLAGS="-D_XOPEN_SOURCE=600 -D_BSD_SOURCE -std=gnu99 -pedantic -Wall -W -Wundef -Wendif-labels -Wshadow -Wpointer-arith -Wcast-align -Wwrite-strings -Wstrict-prototypes -Wmissing-prototypes -Wnested-externs -Winline -Wdisabled-optimization -fstrict-aliasing -O2 -pipe -Wno-parentheses $CFLAGS"
 	PTHREAD_CFLAGS="-pthread"
 	if test "$COMPILER" = "mingw64"; then