Revert "libmarco-private: remove '-1' part from include dir name"

This reverts commit 2bea67f.

Author: vkareh

src/Makefile.am

@@ -128,7 +128,7 @@ libmarco_private_la_SOURCES = \
 libmarco_private_la_LDFLAGS = -no-undefined -version-info 1:0:0
 libmarco_private_la_LIBADD = @MARCO_LIBS@
 
-libmarcoincludedir = $(includedir)/marco/marco-private
+libmarcoincludedir = $(includedir)/marco-1/marco-private
 
 libmarcoinclude_HEADERS = \
 	include/boxes.h \

src/libmarco-private.pc.in

@@ -9,4 +9,4 @@ Description: Marco internals shared
 Requires: gtk+-3.0
 Version: @VERSION@
 Libs: -L${libdir} -lmarco-private
-Cflags: -I${includedir}/marco
+Cflags: -I${includedir}/marco-1