Fixed compilation with libedit in non-standard location.

Compilation failed on missing header files when configured with
--with-libedit=/is/somewhere/else .

src/Makefile.am

@@ -376,6 +376,7 @@ libknotd_la_LIBADD = libknot.la libknot-yparser.la zscanner/libzscanner.la $(lib
 
 knotd_CPPFLAGS = $(AM_CPPFLAGS) $(liburcu_CFLAGS)
 knotd_LDADD = libknotd.la $(liburcu_LIBS)
+knotc_CPPFLAGS = $(AM_CPPFLAGS) $(libedit_CFLAGS)
 knotc_LDADD = libknotd.la libknotus.la $(libedit_LIBS)
 knot1to2_LDADD = libcontrib.la
 
@@ -459,7 +460,7 @@ libknotus_la_SOURCES =				\
 	utils/common/token.c			\
 	utils/common/token.h
 
-libknotus_la_CPPFLAGS = $(AM_CPPFLAGS) $(libidn_CFLAGS)
+libknotus_la_CPPFLAGS = $(AM_CPPFLAGS) $(libidn_CFLAGS) $(libedit_CFLAGS)
 libknotus_la_LDFLAGS = $(AM_LDFLAGS) $(libidn_LIBS)
 libknotus_la_LIBADD = libcontrib.la libknot.la