qt5 packages: set correct PATH when running qmake

The qmake step of qt5 packages may attempt to run pkg-config. If qmake is
executed in an environment where the buildroot host directory is not in
PATH, pkg-config from the build machine may be used (/usr/bin/pkg-config).
This causes qt5 package compilation to fail on machines that do not have
pkg-config installed.
Refer to mailing list thread [1] for a specific error case.

This patch prepends TARGET_MAKE_ENV (which sets PATH) to the qmake call.

Reported-by: Marco Trapanese <marcotrapanese@gmail.com>
Signed-off-by: Thomas De Schampheleire <thomas.de.schampheleire@gmail.com>

[1] http://lists.busybox.net/pipermail/buildroot/2014-March/092283.html
Reviewed-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/qt5/qt5connectivity/qt5connectivity.mk

@@ -23,7 +23,7 @@ QT5CONNECTIVITY_DEPENDENCIES += qt5declarative
 endif
 
 define QT5CONNECTIVITY_CONFIGURE_CMDS
-	(cd $(@D); $(HOST_DIR)/usr/bin/qmake)
+	(cd $(@D); $(TARGET_MAKE_ENV) $(HOST_DIR)/usr/bin/qmake)
 endef
 
 define QT5CONNECTIVITY_BUILD_CMDS

package/qt5/qt5declarative/qt5declarative.mk

@@ -19,7 +19,7 @@ QT5DECLARATIVE_REDISTRIBUTE = NO
 endif
 
 define QT5DECLARATIVE_CONFIGURE_CMDS
-	(cd $(@D); $(HOST_DIR)/usr/bin/qmake)
+	(cd $(@D); $(TARGET_MAKE_ENV) $(HOST_DIR)/usr/bin/qmake)
 endef
 
 define QT5DECLARATIVE_BUILD_CMDS

package/qt5/qt5graphicaleffects/qt5graphicaleffects.mk

@@ -21,7 +21,7 @@ QT5GRAPHICALEFFECTS_REDISTRIBUTE = NO
 endif
 
 define QT5GRAPHICALEFFECTS_CONFIGURE_CMDS
-	(cd $(@D); $(HOST_DIR)/usr/bin/qmake)
+	(cd $(@D); $(TARGET_MAKE_ENV) $(HOST_DIR)/usr/bin/qmake)
 endef
 
 define QT5GRAPHICALEFFECTS_BUILD_CMDS

package/qt5/qt5imageformats/qt5imageformats.mk

@@ -19,7 +19,7 @@ QT5IMAGEFORMATS_REDISTRIBUTE = NO
 endif
 
 define QT5IMAGEFORMATS_CONFIGURE_CMDS
-	(cd $(@D); $(HOST_DIR)/usr/bin/qmake)
+	(cd $(@D); $(TARGET_MAKE_ENV) $(HOST_DIR)/usr/bin/qmake)
 endef
 
 define QT5IMAGEFORMATS_BUILD_CMDS

package/qt5/qt5multimedia/qt5multimedia.mk

@@ -25,7 +25,7 @@ QT5MULTIMEDIA_DEPENDENCIES += gst-plugins-base
 endif
 
 define QT5MULTIMEDIA_CONFIGURE_CMDS
-	(cd $(@D); $(HOST_DIR)/usr/bin/qmake)
+	(cd $(@D); $(TARGET_MAKE_ENV) $(HOST_DIR)/usr/bin/qmake)
 endef
 
 define QT5MULTIMEDIA_BUILD_CMDS

package/qt5/qt5quick1/qt5quick1.mk

@@ -20,7 +20,7 @@ QT5QUICK1_REDISTRIBUTE = NO
 endif
 
 define QT5QUICK1_CONFIGURE_CMDS
-	(cd $(@D); $(HOST_DIR)/usr/bin/qmake)
+	(cd $(@D); $(TARGET_MAKE_ENV) $(HOST_DIR)/usr/bin/qmake)
 endef
 
 define QT5QUICK1_BUILD_CMDS

package/qt5/qt5quickcontrols/qt5quickcontrols.mk

@@ -19,7 +19,7 @@ QT5QUICKCONTROLS_REDISTRIBUTE = NO
 endif
 
 define QT5QUICKCONTROLS_CONFIGURE_CMDS
-	(cd $(@D); $(HOST_DIR)/usr/bin/qmake)
+	(cd $(@D); $(TARGET_MAKE_ENV) $(HOST_DIR)/usr/bin/qmake)
 endef
 
 define QT5QUICKCONTROLS_BUILD_CMDS

package/qt5/qt5script/qt5script.mk

@@ -19,7 +19,7 @@ QT5SCRIPT_REDISTRIBUTE = NO
 endif
 
 define QT5SCRIPT_CONFIGURE_CMDS
-	(cd $(@D); $(HOST_DIR)/usr/bin/qmake)
+	(cd $(@D); $(TARGET_MAKE_ENV) $(HOST_DIR)/usr/bin/qmake)
 endef
 
 define QT5SCRIPT_BUILD_CMDS

package/qt5/qt5sensors/qt5sensors.mk

@@ -23,7 +23,7 @@ QT5SENSORS_DEPENDENCIES += qt5declarative
 endif
 
 define QT5SENSORS_CONFIGURE_CMDS
-	(cd $(@D); $(HOST_DIR)/usr/bin/qmake)
+	(cd $(@D); $(TARGET_MAKE_ENV) $(HOST_DIR)/usr/bin/qmake)
 endef
 
 define QT5SENSORS_BUILD_CMDS

package/qt5/qt5serialport/qt5serialport.mk

@@ -19,7 +19,7 @@ QT5SERIALPORT_REDISTRIBUTE = NO
 endif
 
 define QT5SERIALPORT_CONFIGURE_CMDS
-	(cd $(@D); $(HOST_DIR)/usr/bin/qmake)
+	(cd $(@D); $(TARGET_MAKE_ENV) $(HOST_DIR)/usr/bin/qmake)
 endef
 
 define QT5SERIALPORT_BUILD_CMDS

package/qt5/qt5svg/qt5svg.mk

@@ -20,7 +20,7 @@ QT5SVG_REDISTRIBUTE = NO
 endif
 
 define QT5SVG_CONFIGURE_CMDS
-	(cd $(@D); $(HOST_DIR)/usr/bin/qmake)
+	(cd $(@D); $(TARGET_MAKE_ENV) $(HOST_DIR)/usr/bin/qmake)
 endef
 
 define QT5SVG_BUILD_CMDS

package/qt5/qt5x11extras/qt5x11extras.mk

@@ -19,7 +19,7 @@ QT5X11EXTRAS_REDISTRIBUTE = NO
 endif
 
 define QT5X11EXTRAS_CONFIGURE_CMDS
-	(cd $(@D); $(HOST_DIR)/usr/bin/qmake)
+	(cd $(@D); $(TARGET_MAKE_ENV) $(HOST_DIR)/usr/bin/qmake)
 endef
 
 define QT5X11EXTRAS_BUILD_CMDS

package/qt5/qt5xmlpatterns/qt5xmlpatterns.mk

@@ -19,7 +19,7 @@ QT5XMLPATTERNS_REDISTRIBUTE = NO
 endif
 
 define QT5XMLPATTERNS_CONFIGURE_CMDS
-	(cd $(@D); $(HOST_DIR)/usr/bin/qmake)
+	(cd $(@D); $(TARGET_MAKE_ENV) $(HOST_DIR)/usr/bin/qmake)
 endef
 
 define QT5XMLPATTERNS_BUILD_CMDS