build: Install static lib

This is useful for debian's iotjs-dev package

Change-Id: Ib9f6cb50631f4cdfeb308108f91ed28e7d204dc4
Forwarded: jerryscript-project#1948
Origin: https://github.com/TizenTeam/iotjs/tree/sandbox/rzr/cmake/lib/review/master
Bug: jerryscript-project#1945
Bug-Debian: https://bugs.debian.org/957364
Update: 2020-07-24
IoT.js-DCO-1.0-Signed-off-by: Philippe Coval rzr@users.sf.net

cmake/iotjs.cmake

@@ -497,6 +497,9 @@ set(IOTJS_PUBLIC_HEADERS
 
 # Configure the libiotjs
 set(TARGET_LIB_IOTJS libiotjs)
+# Configure the libiotjs.a
+set(TARGET_STATIC_IOTJS libiotjs)
+
 if(CREATE_SHARED_LIB)
   add_library(${TARGET_LIB_IOTJS} SHARED ${LIB_IOTJS_SRC})
 else()
@@ -553,7 +556,13 @@ target_link_libraries(${TARGET_LIB_IOTJS}
   ${MBEDTLS_LIBS}
   ${EXTERNAL_LIBS}
 )
-
+target_link_libraries(${TARGET_STATIC_IOTJS}
+  ${JERRY_LIBS}
+  ${TUV_LIBS}
+  libhttp-parser
+  ${MBEDTLS_LIBS}
+  ${EXTERNAL_LIBS}
+)
 if("${LIB_INSTALL_DIR}" STREQUAL "")
   set(LIB_INSTALL_DIR "lib")
 endif()
@@ -580,6 +589,7 @@ if(NOT BUILD_LIB_ONLY)
           RUNTIME DESTINATION "${INSTALL_PREFIX}/bin"
           LIBRARY DESTINATION "${INSTALL_PREFIX}/lib"
           PUBLIC_HEADER DESTINATION "${INSTALL_PREFIX}/include/iotjs")
+  install(TARGETS ${TARGET_LIB_IOTJS} DESTINATION ${LIB_INSTALL_DIR}) 
   if(CREATE_SHARED_LIB)
     install(TARGETS ${TARGET_LIB_IOTJS}
             RUNTIME DESTINATION "${INSTALL_PREFIX}/bin"