The function, main, is added to profiling output of static executable
which must link against gcrt1.o.
* Makeconfig (+link-static-before-libc): Use the first of
$(CRT-$(@F)) and $(csu-objpfx)$(static-start-installed-name).
* gmon/Makefile (tests): Add tst-gmon-static.
(tests-static): Likewise.
(CFLAGS-tst-gmon-static.c): New.
(CRT-tst-gmon-static): Likewise.
(DEFAULT-LDFLAGS-tst-gmon-static): Likewise.
(tst-gmon-static-ENV): Likewise.
(tests-special): Likewise.
($(objpfx)tst-gmon-static.out): Likewise.
(clean-tst-gmon-static-data): Likewise.
($(objpfx)tst-gmon-static-gprof.out): Likewise.
* gmon/tst-gmon-static-gprof.sh: New file.
* gmon/tst-gmon-static.c: Likewise.
