qextserialport: tell qmake to generate .pc file

Instead of creating our own .pc file with a patch, just tell qmake to
do it by adding create_pc to CONFIG.

This corrects the .pc file for Qt5. Previously, the include directory
was set to /usr/include, while for Qt5 it should be /usr/include/qt5.
This hasn't caused any autobuild failures since no other package uses
qextserialport.

Note, however, that the package is now called Qt5ExtSerialPort in Qt5,
while before it was qextserialport like in the Qt4 case.

Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/qextserialport/0003-Tell-qmake-to-add-a-pkgconfig-file-to-ease-usage-wit.patch

@@ -0,0 +1,28 @@
+From 14d4d3e7b5c748118acffddd397fb67b37fd5054 Mon Sep 17 00:00:00 2001
+From: "Arnout Vandecappelle (Essensium/Mind)" <arnout@mind.be>
+Date: Thu, 24 Nov 2016 22:44:02 +0100
+Subject: [PATCH] Tell qmake to add a pkgconfig file to ease usage with
+ applications
+
+Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>
+---
+ qextserialport.pro | 3 ++-
+ 1 file changed, 2 insertions(+), 1 deletion(-)
+
+diff --git a/qextserialport.pro b/qextserialport.pro
+index 8d2c03a..2fcb39c 100644
+--- a/qextserialport.pro
++++ b/qextserialport.pro
+@@ -42,7 +42,8 @@ TEMPLATE=lib
+ include(src/qextserialport.pri)
+ 
+ #create_prl is needed, otherwise, MinGW can't found libqextserialport1.a
+-CONFIG += create_prl
++CONFIG += create_prl create_pc
++QMAKE_PKGCONFIG_DESTDIR = pkgconfig
+ 
+ #mac framework is designed for shared library
+ macx:qesp_mac_framework:qesp_static: CONFIG -= qesp_static
+-- 
+2.10.2
+

package/qextserialport/0003-pkgconfig.patch

@@ -1,19 +0,0 @@
-Add a pkgconfig file to ease usage with applications
-
-Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
-
-Index: qextserialport-ef4af2a2ee3f/qextserialport.pc
-===================================================================
---- /dev/null
-+++ qextserialport-ef4af2a2ee3f/qextserialport.pc
-@@ -0,0 +1,10 @@
-+prefix=/usr
-+exec_prefix=${prefix}
-+libdir=${prefix}/lib
-+includedir=${prefix}/include/QtExtSerialPort
-+
-+Name: QtExtSerialPort
-+Description: QtExtSerialPort library
-+Version: 1.2.0
-+Libs: -L${libdir} -lqextserialport
-+Cflags: -I${includedir}

package/qextserialport/qextserialport.mk

@@ -32,7 +32,6 @@ endef
 
 define QEXTSERIALPORT_INSTALL_STAGING_CMDS
 	$(TARGET_MAKE_ENV) $(MAKE) -C $(@D) install
-	cp $(@D)/qextserialport.pc $(STAGING_DIR)/usr/lib/pkgconfig/
 endef
 
 ifeq ($(BR2_STATIC_LIBS),y)