add pkgsrc hooks for building pkgs w/nbsd_libc

Add two makefiles to manage compiling packages with NetBSD libc.

  *  minix.libc.mk contains the proper CFLAGS/LDFLAGS
  *  pkgsrchooks.mk contains the logic for setting the flags.
  *  update bmake

Several pkg-config files were added to help pkgsrc learn about
the c, minlib, and compat_minix libraries.

lib/nbsd_libc/Makefile

@@ -172,3 +172,7 @@ CSHLIBFLAGS+=	-D_I18N_DYNAMIC
 # force the dynamic linker to initialize libc first
 SHLIB_SHFLAGS+=	-Wl,-z,initfirst
 
+.include <bsd.own.mk>
+SUBDIR+= pkgconfig
+.include <bsd.subdir.mk>
+

lib/nbsd_libc/pkgconfig/Makefile

@@ -0,0 +1,9 @@
+NOOBJ=  # defined
+
+.include <bsd.own.mk>
+
+FILES=libc.pc
+FILESDIR=/usr/netbsd/lib
+FILESMODE=444
+
+.include <bsd.prog.mk>

lib/nbsd_libc/pkgconfig/libc.pc

@@ -0,0 +1,5 @@
+Name: c
+Description: NetBSD C Library
+Version: 1.0
+Libs: -nostdlib /usr/netbsd/lib/crt1.o /usr/netbsd/lib/crti.o /usr/netbsd/lib/crtn.o -L/usr/netbsd/lib -lc -L/usr/pkg/lib -lgcc -L/usr/netbsd/lib -lminlib -lcompat_minix
+Cflags: -nostdinc -D__NBSD_LIBC -isystem /usr/netbsd/include

lib/nbsd_libcompat_minix/Makefile

@@ -44,4 +44,8 @@ SRCS+= cuserid.c
 
 .include "include/Makefile.inc"
 
+.include <bsd.own.mk>
+SUBDIR+= pkgconfig
+.include <bsd.subdir.mk>
+
 .include <bsd.lib.mk>

lib/nbsd_libcompat_minix/pkgconfig/Makefile

@@ -0,0 +1,9 @@
+NOOBJ=  # defined
+
+.include <bsd.own.mk>
+
+FILES=compat_minix.pc
+FILESDIR=/usr/netbsd/lib
+FILESMODE=444
+
+.include <bsd.prog.mk>

lib/nbsd_libcompat_minix/pkgconfig/compat_minix.pc

@@ -0,0 +1,5 @@
+Name: compat_minix
+Description: Minix Compatibility Library
+Version: 1.0
+Libs: -L/usr/netbsd/lib -lcompat_minix
+Cflags: -I/usr/netbsd/include

lib/nbsd_libminlib/Makefile

@@ -35,4 +35,8 @@ INCS+= tools.h
 
 .include "${MACHINE}/Makefile.inc"
 
+.include <bsd.own.mk>
+SUBDIR+= pkgconfig
+.include <bsd.subdir.mk>
+
 .include <bsd.lib.mk>

lib/nbsd_libminlib/pkgconfig/Makefile

@@ -0,0 +1,9 @@
+NOOBJ=  # defined
+
+.include <bsd.own.mk>
+
+FILES=minlib.pc
+FILESDIR=/usr/netbsd/lib
+FILESMODE=444
+
+.include <bsd.prog.mk>

lib/nbsd_libminlib/pkgconfig/minlib.pc

@@ -0,0 +1,6 @@
+Name: minlib
+Description: Minix Compatibility Library
+Version: 1.0
+Libs: -L/usr/netbsd/lib -lminlib
+Cflags: -I/usr/netbsd/include
+