cmake: make libcurl output filename configurable

Reviewed-by: Jakub Zakrzewski
Closes #6933

lib/CMakeLists.txt

@@ -20,6 +20,7 @@
 #
 ###########################################################################
 set(LIB_NAME libcurl)
+set(LIBCURL_OUTPUT_NAME libcurl CACHE STRING "Basename of the curl library")
 
 if(BUILD_SHARED_LIBS)
   set(CURL_STATICLIB NO)
@@ -98,7 +99,10 @@ if(WIN32)
   add_definitions(-D_USRDLL)
 endif()
 
-set_target_properties(${LIB_NAME} PROPERTIES COMPILE_DEFINITIONS BUILDING_LIBCURL)
+set_target_properties(${LIB_NAME} PROPERTIES
+  COMPILE_DEFINITIONS BUILDING_LIBCURL
+  OUTPUT_NAME ${LIBCURL_OUTPUT_NAME}
+  )
 
 if(HIDES_CURL_PRIVATE_SYMBOLS)
   set_property(TARGET ${LIB_NAME} APPEND PROPERTY COMPILE_DEFINITIONS "CURL_HIDDEN_SYMBOLS")