[Flang-RT] Make implicit PPC intrinsic uses explicit

flang-rt/lib/runtime/__ppc_intrinsics.f90

@@ -7,6 +7,9 @@
 !===------------------------------------------------------------------------===!
 
 module __ppc_intrinsics
+  ! implicit dependencies, made explicit for CMake
+  use __fortran_builtins
+  use __ppc_types
 
   private
 

flang-rt/lib/runtime/__ppc_types.f90

@@ -7,6 +7,7 @@
 !===------------------------------------------------------------------------===!
 
 module __ppc_types
+  use __fortran_builtins ! implicit dependency, made explicit for CMake
   implicit none
 
   ! Set PRIVATE by default to explicitly only export what is meant

flang-rt/lib/runtime/mma.f90

@@ -7,6 +7,10 @@
 !===------------------------------------------------------------------------===!
 
 module mma
+  ! implicit dependencies, made explicit for CMake
+  use __fortran_builtins
+  use __ppc_types
+
   implicit none
   private