component/gcc: enable default PIE

See merge request !1587

Revert eb1b1a41 to avoid the use of
`fPIC` flag as it is a "contagious" build option.

To not face the build error "relocation R_X86_64_32 against
.rodata.str1.8 can not be used when making a shared object; recompile
with -fPIC" while building a shared library without fPIC flag, `gcc` is
compiled with `-enable-default-pie` flag (which is a compilation option
used for `gcc` binaries provided by Debian by example, see `gcc -v`).

component/gcc/buildout.cfg

@@ -28,6 +28,7 @@ configure-options =
   --with-gmp=${gmp:location}
   --with-mpfr=${mpfr:location}
   --with-mpc=${mpc:location}
+  --enable-default-pie
   --enable-languages="c,c++,fortran"
   --with-isl=${isl:location}
   --with-ld=@@LOCATION@@/bin/ld

component/qjs-wrapper/buildout.cfg

@@ -19,4 +19,4 @@ path = ${qjs-wrapper-source:location}
 autopilot-wrapper =
 environment =
   C_INCLUDE_PATH=include:${open62541:location}/include:${open62541:location}/deps:${open62541:location}/src/pubsub:${quickjs:location}/include
-  LDFLAGS=-L${open62541:location}/lib -Wl,-rpath=${open62541:location}/lib -L${:autopilot-wrapper}/lib -Wl,-rpath=${:autopilot-wrapper}/lib -fPIC
+  LDFLAGS=-L${open62541:location}/lib -Wl,-rpath=${open62541:location}/lib -L${:autopilot-wrapper}/lib -Wl,-rpath=${:autopilot-wrapper}/lib

software/js-drone/software-c-astral.cfg

@@ -21,7 +21,7 @@ url = https://lab.nexedi.com/nexedi/c-astral-wrapper/-/archive/v2.1/c-astral-wra
 md5sum = cca66724e1b7a61c1b9559fde95c420b
 environment =
   CPLUS_INCLUDE_PATH=${qjs-wrapper-source:location}/include:${mavsdk:location}/include:${mavsdk:location}/include/mavsdk
-  LDFLAGS=-L${mavsdk:location}/lib -Wl,-rpath=${mavsdk:location}/lib -fPIC
+  LDFLAGS=-L${mavsdk:location}/lib -Wl,-rpath=${mavsdk:location}/lib
 
 [qjs-wrapper]
 autopilot-wrapper = ${c-astral-wrapper:location}