Add missing dg-require-effective-target fpic directives to powerpc tests

Add missing dg-require-effective-target fpic directives to powerpc tests

for  gcc/testsuite/ChangeLog

	* gcc.target/powerpc/compress-float-ppc-pic.c: Add
	dg-require-effective-target fpic.
	* gcc.target/powerpc/ppc-eabi.c: Likewise.
	* gcc.target/powerpc/pr26350.c: Likewise.
	* gcc.target/powerpc/pr67789.c: Likewise.
	* gcc.target/powerpc/pr79439-1.c: Likewise.
	* gcc.target/powerpc/pr79439-2.c: Likewise.
	* gcc.target/powerpc/pr79439-3.c: Likewise.
	* gcc.target/powerpc/pr83629.c: Likewise.
	* gcc.target/powerpc/pr84112.c: Likewise.