CMake: Remove "-no-pie" build option

libdecor/build/Makefile: unused anyway (previously used building demos)

src/CMakeLists.txt: broke some user builds, see fltk.general, thread
  "-no-pie in FLTK Libraries build." (Mar 17, 2024).

Todo: check usage of "-fPIC" (libdecor builds)

libdecor/build/Makefile

@@ -1,7 +1,7 @@
 #
 # Library Makefile for the Fast Light Tool Kit (FLTK).
 #
-# Copyright 2022-2023 by Bill Spitzak and others.
+# Copyright 2022-2024 by Bill Spitzak and others.
 #
 # This library is free software. Distribution and use rights are outlined in
 # the file "COPYING" which should have been included with this file.  If this
@@ -29,10 +29,6 @@ EXTRA_DECOR =  ${${UNAME}_CFLAGS}
 CFLAGS_DECOR =  -I. -I../.. -I../../src -I../src -I../src/plugins $(EXTRA_DECOR) -fPIC -D_GNU_SOURCE \
    -DHAVE_MEMFD_CREATE -DHAVE_MKOSTEMP -DHAVE_POSIX_FALLOCATE
 
-Linux_NOPIE = -no-pie
-FreeBSD_NOPIE =
-NOPIE = ${${UNAME}_NOPIE}
-
 all : $(OBJECTS)
 
 depend:

src/CMakeLists.txt

@@ -765,9 +765,6 @@ if(UNIX AND FLTK_BACKEND_WAYLAND)
   if(DBUS_FOUND)
     list(APPEND OPTIONAL_LIBS "${DBUS_LDFLAGS}")
   endif(DBUS_FOUND)
-  if(CMAKE_HOST_SYSTEM_NAME STREQUAL "Linux" AND NOT FLTK_BUILD_SHARED_LIBS)
-    list(APPEND OPTIONAL_LIBS "-no-pie")
-  endif(CMAKE_HOST_SYSTEM_NAME STREQUAL "Linux" AND NOT FLTK_BUILD_SHARED_LIBS)
 endif(UNIX AND FLTK_BACKEND_WAYLAND)
 
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