pjproject: use preferred standard C++ lib

Currently libstdc++ is hardcoded. Change that and use whatever standard
C++ lib has preference.

Signed-off-by: Sebastian Kemper <sebastian_ml@gmx.net>

libs/pjproject/Makefile

@@ -11,7 +11,7 @@ include $(TOPDIR)/rules.mk
 
 PKG_NAME:=pjproject
 PKG_VERSION:=2.7.2
-PKG_RELEASE:=1
+PKG_RELEASE:=2
 
 PKG_SOURCE:=pjproject-$(PKG_VERSION).tar.bz2
 PKG_SOURCE_URL:=http://www.pjsip.org/release/$(PKG_VERSION)
@@ -27,6 +27,7 @@ PKG_BUILD_DIR:=$(BUILD_DIR)/$(PKG_NAME)-$(PKG_VERSION)
 
 PKG_CONFIG_DEPENDS:=CONFIG_SOFT_FLOAT
 
+include $(INCLUDE_DIR)/uclibc++.mk
 include $(INCLUDE_DIR)/package.mk
 
 define Package/pjproject/Default
@@ -34,7 +35,7 @@ define Package/pjproject/Default
   CATEGORY:=Libraries
   SUBMENU:=Telephony
   URL:=http://www.pjsip.org
-  DEPENDS:=+libopenssl +libuuid +libstdcpp +libpthread
+  DEPENDS:=$(CXX_DEPENDS) +libopenssl +libuuid +libpthread
 endef
 
 define Package/pjproject/install/lib

libs/pjproject/patches/160-remove-hardcoded-lstdc++.patch

@@ -0,0 +1,22 @@
+--- a/build.mak.in
++++ b/build.mak.in
+@@ -293,7 +293,6 @@ export APP_LDLIBS := $(PJSUA_LIB_LDLIB)
+ 	$(PJLIB_LDLIB) \
+ 	@LIBS@
+ export APP_LDXXLIBS := $(PJSUA2_LIB_LDLIB) \
+-	-lstdc++ \
+ 	$(APP_LDLIBS)
+ 
+ # Here are the variabels to use if application is using the library
+--- a/pjsip/build/Makefile
++++ b/pjsip/build/Makefile
+@@ -152,8 +152,7 @@ export PJSUA2_LIB_LDFLAGS += $(PJSUA_LIB
+ 			     $(PJNATH_LDLIB) \
+ 			     $(PJLIB_UTIL_LDLIB) \
+ 			     $(PJLIB_LDLIB) \
+-			     $(_LDFLAGS) \
+-			     -lstdc++
++			     $(_LDFLAGS)
+ 
+ 
+ ###############################################################################