libcap: Fix pkgconfig file

Helps packages that use pkgconfig to find libcap when installed in OpenWrt

Signed-off-by: Rosen Penev <rosenp@gmail.com>

libs/libcap/Makefile

@@ -9,7 +9,7 @@ include $(TOPDIR)/rules.mk
 
 PKG_NAME:=libcap
 PKG_VERSION:=2.27
-PKG_RELEASE:=1
+PKG_RELEASE:=2
 
 PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION).tar.xz
 PKG_SOURCE_URL:=@KERNEL/linux/libs/security/linux-privs/libcap2
@@ -69,9 +69,13 @@ endif
 define Build/InstallDev
 	$(INSTALL_DIR) $(1)/usr/include/sys
 	$(CP) $(PKG_INSTALL_DIR)/usr/include/* $(1)/usr/include/
-	$(INSTALL_DIR) $(1)/usr/lib/
+	$(INSTALL_DIR) $(1)/usr/lib
 	$(CP) $(PKG_INSTALL_DIR)/lib/* $(1)/usr/lib/
 	$(CP) $(PKG_INSTALL_DIR)/usr/lib/* $(1)/usr/lib/
+	$(INSTALL_DIR) $(1)/usr/lib/pkgconfig
+	$(SED) 's,exec_prefix=,exec_prefix=/usr,g' $(1)/usr/lib/pkgconfig/libcap.pc
+	$(SED) 's,/lib,$$$${exec_prefix}/lib,g' $(1)/usr/lib/pkgconfig/libcap.pc
+	$(SED) 's,/usr/include,$$$${prefix}/include,g' $(1)/usr/lib/pkgconfig/libcap.pc
 endef
 
 define Package/libcap/install