pmc: Add include path for libpmcstat as it is an internallib

[emaste]

does this mean we can't automatically prevent header installation when INTERNALLIB?

[manu]

In D24173#531679, @emaste wrote:

does this mean we can't automatically prevent header installation when INTERNALLIB?

We can, I need to re-apply r359267.
This was needed as the tools used the installed path for including pmcstat.h

head/lib/libpmc/Makefile

 .if ${MACHINE_ARCH} == "aarch64"
 EVENT_ARCH="arm64"
 .elif ${MACHINE_ARCH} == "amd64" || ${MACHINE_ARCH} == "i386"
 EVENT_ARCH="x86"
 .elif ${MACHINE_ARCH} == "powerpc"
 EVENT_ARCH="powerpc"
 .endif
 
+CFLAGS+= -I${SRCTOP}/${RELDIR:H}/libpmcstat
+
 .if ${MK_DIRDEPS_BUILD} == "yes"
 # avoid circular dependency
-CFLAGS+= -I${SRCTOP}/${RELDIR:H}/libpmcstat
 GENDIRDEPS_FILTER+= N${RELDIR:H}/libpmcstat
 JEVENTS?= ${HOST_OBJTOP}/${RELDIR}/pmu-events/jevents
 .else
 JEVENTS= ${BTOOLSPATH:U.}/pmu-events/jevents
 
 # This file is built in a subdirectory so never try to rebuild it here.
 ${JEVENTS}: .PHONY
 .if make(*clean*)

head/usr.sbin/pmc/Makefile

 #
 # $FreeBSD$
 #
 
 .include <src.opts.mk>
 PROG_CXX=       pmc
 MAN=    
 WARNS?= 3
 CXXFLAGS+= -O0
 CXXSTD= c++14
 CWARNFLAGS.gcc+= -Wno-redundant-decls
+CFLAGS+= -I${SRCTOP}/lib/libpmcstat
 
 LIBADD= kvm pmc m ncursesw pmcstat elf
 
 SRCS=   pmc.c pmc_util.c cmd_pmc_stat.c \
         cmd_pmc_list.c cmd_pmc_filter.cc \
         cmd_pmc_summary.cc
 
 .include <bsd.prog.mk>