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[tests/libc] Detect pie compilers

Some compilers have pie enabled by default, and it builds a wrong
executable. This patch fixes the problem detecting if pie is
enabled in the compiler. This patch is known to work only in
OpenBSD, new patches about this are expected.

--- a/lib/c/target/amd64-sysv-openbsd/Makefile

+++ b/lib/c/target/amd64-sysv-openbsd/Makefile

@@ -4,7 +4,7 @@

 include $(PROJECTDIR)/rules.mk

 SYSNAME    = amd64-sysv-openbsd

-SCC_CFLAGS = -g -fno-stack-protector -static -nostdinc -I$(INCDIR) -I$(INCDIR)/bits/amd64-sysv/ -I.

+SCC_CFLAGS = -g -nopie -fno-stack-protector -static -nostdinc -I$(INCDIR) -I$(INCDIR)/bits/amd64-sysv/ -I.

 SYSOBJ     = raise.o signal.o _sigaction.o

 include syscall.mk

--- a/tests/libc/execute/cc.sh

+++ b/tests/libc/execute/cc.sh

@@ -37,5 +37,10 @@

 lib=$root/lib/scc/${abi}-${sys}

 obj=${1%.c}.o

-gcc -g -fno-stack-protector --freestanding -std=c99 -static -nostdinc -I$inc -I$arch_inc -c $1

-ld -g -z nodefaultlib -static -L$lib $lib/crt.o $obj -lc -o $out

+if ! gcc -nopie 2>&1 | grep unrecogn >/dev/null

+then

+	pie=-nopie

+fi

+

+gcc -g $pie -fno-stack-protector --freestanding -std=c99 -static -nostdinc -I$inc -I$arch_inc -c $1

+ld -g $pie -z nodefaultlib -static -L$lib $lib/crt.o $obj -lc -o $out