libjson-c: fix pkgconfig file

The pkgconfig file references the host directories, not the openwrt
ones. Used SED to fix as is done elsewhere. Removed CMAKE_INSTALL as a
result.

Removed now pointless CFLAGS.

Added PKG_BUILD_PARALLEL for faster compilation.

Various rearrangements for consistency between packages.

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

package/libs/libjson-c/Makefile

@@ -9,29 +9,24 @@ include $(TOPDIR)/rules.mk
 
 PKG_NAME:=json-c
 PKG_VERSION:=0.14
-PKG_RELEASE:=1
+PKG_RELEASE:=2
 
 PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION)-nodoc.tar.gz
 PKG_SOURCE_URL:=https://s3.amazonaws.com/json-c_releases/releases/
 PKG_HASH:=99914e644a25201d82ccefa20430f7515c110923360f9ef46755527c02412afa
 
+PKG_MAINTAINER:=Felix Fietkau <nbd@nbd.name>
 PKG_LICENSE:=MIT
 PKG_LICENSE_FILES:=COPYING
 PKG_CPE_ID:=cpe:/a:json-c_project:json-c
 
-CMAKE_INSTALL:=1
-CMAKE_OPTIONS += -DCMAKE_INSTALL_INCLUDEDIR=$(STAGING_DIR)/usr/include
-
-PKG_MAINTAINER:=Felix Fietkau <nbd@nbd.name>
+PKG_BUILD_PARALLEL:=1
+HOST_BUILD_PREFIX:=$(STAGING_DIR_HOST)
 
 include $(INCLUDE_DIR)/package.mk
 include $(INCLUDE_DIR)/host-build.mk
 include $(INCLUDE_DIR)/cmake.mk
 
-TARGET_CFLAGS += $(FPIC) -Wno-implicit-fallthrough
-HOST_CFLAGS += -Wno-implicit-fallthrough
-HOST_BUILD_PREFIX:=$(STAGING_DIR_HOST)
-
 define Package/libjson-c
   SECTION:=libs
   CATEGORY:=Libraries
@@ -44,6 +39,12 @@ define Package/libjson-c/description
  This package contains a library for javascript object notation backends.
 endef
 
+define Build/InstallDev
+	$(call Build/InstallDev/cmake,$(1))
+	$(SED) 's,/usr/include,$$$${prefix}/include,g' $(1)/usr/lib/pkgconfig/json-c.pc
+	$(SED) 's,/usr/lib,$$$${exec_prefix}/lib,g' $(1)/usr/lib/pkgconfig/json-c.pc
+endef
+
 define Package/libjson-c/install
 	$(INSTALL_DIR) $(1)/usr/lib
 	$(CP) $(PKG_INSTALL_DIR)/usr/lib/libjson-c.so.* $(1)/usr/lib/