Pass PKG_CONFIG_PATH down from top-level Makefile

[Sending to binutils, gdb-patches and gcc-patches, since it touches the
top-level Makefile/configure]

I have my debuginfod library installed in a non-standard location
(/opt/debuginfod), which requires me to set
PKG_CONFIG_PATH=/opt/debuginfod/lib/pkg-config.  If I just set it during
configure:

    $ PKG_CONFIG_PATH=/opt/debuginfod/lib/pkg-config ./configure --with-debuginfod
    $ make

or

    $ ./configure --with-debuginfod PKG_CONFIG_PATH=/opt/debuginfod/lib/pkg-config
    $ make

Then PKG_CONFIG_PATH is only present (and ignored) during the top-level
configure.  When running make (which runs gdb's and binutils'
configure), PKG_CONFIG_PATH is not set, which results in their configure
script not finding the library:

    checking for libdebuginfod >= 0.179... no
    configure: error: "--with-debuginfod was given, but libdebuginfod is missing or unusable."

Change the top-level configure/Makefile system to capture the value
passed when configuring the top-level and pass it down to
subdirectories (similar to CFLAGS, LDFLAGS, etc).

I don't know much about the top-level build system, so I really don't
know if I did this correctly.  The changes are:

 - Use AC_SUBST(PKG_CONFIG_PATH) in configure.ac, so that
   @PKG_CONFIG_PATH@ gets replaced with the actual PKG_CONFIG_PATH value
   in config files (i.e. Makefile)
 - Add a PKG_CONFIG_PATH Makefile variable in Makefile.tpl, initialized
   to @PKG_CONFIG_PATH@
 - Add PKG_CONFIG_PATH to HOST_EXPORTS in Makefile.tpl, which are the
   variables set when running the sub-configures

I initially added PKG_CONFIG_PATH to flags_to_pass, in Makefile.def, but
I don't think it's needed.  AFAIU, this defines the flags to pass down
when calling "make" in subdirectories.  We only need PKG_CONFIG_PATH to
be passed down during configure.  After that, it's captured in
gdb/config.status, so even if a "make" causes a re-configure later
(because gdb/configure has changed, for example), the PKG_CONFIG_PATH
value will be remembered.

Change-Id: I91138dfca41c43b05e53e445f62e4b27882536bf

ChangeLog:

	* configure.ac: Add AC_SUBST(PKG_CONFIG_PATH).
	* configure: Re-generate.
	* Makefile.tpl (HOST_EXPORTS): Pass PKG_CONFIG_PATH.
	(PKG_CONFIG_PATH): New.
	* Makefile.in: Re-generate.

Makefile.in

@@ -221,6 +221,7 @@ HOST_EXPORTS = \
 	OBJCOPY="$(OBJCOPY)"; export OBJCOPY; \
 	OBJDUMP="$(OBJDUMP)"; export OBJDUMP; \
 	OTOOL="$(OTOOL)"; export OTOOL; \
+	PKG_CONFIG_PATH="$(PKG_CONFIG_PATH)"; export PKG_CONFIG_PATH; \
 	READELF="$(READELF)"; export READELF; \
 	AR_FOR_TARGET="$(AR_FOR_TARGET)"; export AR_FOR_TARGET; \
 	AS_FOR_TARGET="$(AS_FOR_TARGET)"; export AS_FOR_TARGET; \
@@ -447,6 +448,8 @@ GOCFLAGS = $(CFLAGS)
 GDCFLAGS = @GDCFLAGS@
 GM2FLAGS = $(CFLAGS)
 
+PKG_CONFIG_PATH = @PKG_CONFIG_PATH@
+
 # Pass additional PGO and LTO compiler options to the PGO build.
 BUILD_CFLAGS = $(PGO_BUILD_CFLAGS) $(PGO_BUILD_LTO_CFLAGS)
 override CFLAGS += $(BUILD_CFLAGS)

Makefile.tpl

@@ -224,6 +224,7 @@ HOST_EXPORTS = \
 	OBJCOPY="$(OBJCOPY)"; export OBJCOPY; \
 	OBJDUMP="$(OBJDUMP)"; export OBJDUMP; \
 	OTOOL="$(OTOOL)"; export OTOOL; \
+	PKG_CONFIG_PATH="$(PKG_CONFIG_PATH)"; export PKG_CONFIG_PATH; \
 	READELF="$(READELF)"; export READELF; \
 	AR_FOR_TARGET="$(AR_FOR_TARGET)"; export AR_FOR_TARGET; \
 	AS_FOR_TARGET="$(AS_FOR_TARGET)"; export AS_FOR_TARGET; \
@@ -450,6 +451,8 @@ GOCFLAGS = $(CFLAGS)
 GDCFLAGS = @GDCFLAGS@
 GM2FLAGS = $(CFLAGS)
 
+PKG_CONFIG_PATH = @PKG_CONFIG_PATH@
+
 # Pass additional PGO and LTO compiler options to the PGO build.
 BUILD_CFLAGS = $(PGO_BUILD_CFLAGS) $(PGO_BUILD_LTO_CFLAGS)
 override CFLAGS += $(BUILD_CFLAGS)

configure

@@ -622,6 +622,7 @@ CXX_FOR_TARGET
 CC_FOR_TARGET
 RANLIB_PLUGIN_OPTION
 AR_PLUGIN_OPTION
+PKG_CONFIG_PATH
 GDCFLAGS
 READELF
 OTOOL
@@ -13017,6 +13018,7 @@ fi
 
 GDCFLAGS=${GDCFLAGS-${CFLAGS}}
 
+
 { $as_echo "$as_me:${as_lineno-$LINENO}: checking for -plugin option" >&5
 $as_echo_n "checking for -plugin option... " >&6; }
 

configure.ac

@@ -3708,6 +3708,7 @@ AC_SUBST(CXXFLAGS)
 AC_SUBST(GDC)
 AC_SUBST(GDCFLAGS)
 GDCFLAGS=${GDCFLAGS-${CFLAGS}}
+AC_SUBST(PKG_CONFIG_PATH)
 
 GCC_PLUGIN_OPTION(PLUGIN_OPTION)
 AR_PLUGIN_OPTION=