[5055] Use pkgincludedir in several Makefile.am.

src/lib/dns/Makefile.am

@@ -176,7 +176,7 @@ s-rdatacode: Makefile $(EXTRA_DIST)
 
 #rrclass.h rrtype.h rrparamregistry.cc rdataclass.h rdataclass.cc: s-rdatacode
 
-libdns___includedir = $(includedir)/$(PACKAGE_NAME)/dns
+libdns___includedir = $(pkgincludedir)/dns
 libdns___include_HEADERS = \
 	edns.h \
 	exceptions.h \

src/lib/exceptions/Makefile.am

@@ -8,5 +8,5 @@ libkea_exceptions_la_SOURCES = exceptions.h exceptions.cc
 
 CLEANFILES = *.gcno *.gcda
 
-libkea_exceptions_includedir = $(includedir)/$(PACKAGE_NAME)/exceptions
+libkea_exceptions_includedir = $(pkgincludedir)/exceptions
 libkea_exceptions_include_HEADERS = exceptions.h

src/lib/stats/Makefile.am

@@ -16,5 +16,5 @@ libkea_stats_la_LIBADD  = $(top_builddir)/src/lib/cc/libkea-cc.la
 libkea_stats_la_LIBADD += $(top_builddir)/src/lib/util/libkea-util.la
 libkea_stats_la_LIBADD += $(top_builddir)/src/lib/exceptions/libkea-exceptions.la
 
-libkea_stats_includedir = $(includedir)/$(PACKAGE_NAME)/stats
+libkea_stats_includedir = $(pkgincludedir)/stats
 libkea_stats_include_HEADERS = stats_mgr.h

src/lib/util/Makefile.am

@@ -41,7 +41,7 @@ libkea_util_la_LDFLAGS  = -no-undefined -version-info 2:0:0
 
 CLEANFILES = *.gcno *.gcda
 
-libkea_util_includedir = $(includedir)/$(PACKAGE_NAME)/util
+libkea_util_includedir = $(pkgincludedir)/util
 libkea_util_include_HEADERS = \
     buffer.h \
     io_utilities.h \