Compile mathtext, minicern, rpdutil, and rsa with -fPIC

These are temporary static libraries that need to be linked to a
final shared library, so they must be compiled with -fPIC.

graf2d/mathtext/CMakeLists.txt

 ROOT_LINKER_LIBRARY(mathtext *.cxx TYPE STATIC NOINSTALL)
-
+set_property(TARGET mathtext PROPERTY POSITION_INDEPENDENT_CODE ON)

misc/minicern/CMakeLists.txt

@@ -2,8 +2,8 @@
 # CMakeLists.txt file for building ROOT misc/minicern package
 ############################################################################
 
-set(CMAKE_Fortran_FLAGS "${CMAKE_Fortran_FLAGS} -fPIC")
 ROOT_LINKER_LIBRARY(minicern *.c *.f TYPE STATIC NOINSTALL)
+set_property(TARGET minicern PROPERTY POSITION_INDEPENDENT_CODE ON)
 target_link_libraries(minicern ${CMAKE_Fortran_IMPLICIT_LINK_LIBRARIES})
 
 # Disable optimization since it some cases was causing crashes.

net/auth/CMakeLists.txt

@@ -25,6 +25,7 @@ include_directories(${CMAKE_CURRENT_SOURCE_DIR}/res)
 add_library(rsa STATIC ${CMAKE_CURRENT_SOURCE_DIR}/src/rsaaux.cxx
                        ${CMAKE_CURRENT_SOURCE_DIR}/src/rsalib.cxx
                        ${CMAKE_CURRENT_SOURCE_DIR}/src/rsafun.cxx)
+set_property(TARGET rsa PROPERTY POSITION_INDEPENDENT_CODE ON)
 add_dependencies(rsa move_headers)
 
 if(ssl)

net/rpdutils/CMakeLists.txt

@@ -35,6 +35,7 @@ endif()
 
 #---static library needed for rootd and proofd --------------------------------------------
 add_library(rpdutil STATIC ${rpdutilsrcs})
+set_property(TARGET rpdutil PROPERTY POSITION_INDEPENDENT_CODE ON)
 add_dependencies(rpdutil move_headers)
 
 ROOT_LINKER_LIBRARY(SrvAuth rpdutils.cxx ssh.cxx LIBRARIES rpdutil rsa ${CRYPTLIBS} ${GLOBUS_LIBRARIES} ${OPENSSL_LIBRARIES} DEPENDENCIES Net BUILTINS OPENSSL)