package/libcap: fix build failure due to unessesary patch

package/libcap: fix build failure due to unessesary patch

Fix the following build failure which is raised since bump
to version 2.52 in commit 38b0759432070f7a57c0fab84d44a07caead6f06

	Applying 0001-Permit-compilation-with-std-c89.patch using patch:
	patching file Makefile
	Reversed (or previously applied) patch detected!  Skipping patch.
	1 out of 1 hunk ignored -- saving rejects to file Makefile.rej
	patching file libcap/cap_test.c
	Reversed (or previously applied) patch detected!  Skipping patch.
	1 out of 1 hunk ignored -- saving rejects to file libcap/cap_test.c.rej
	patching file psx/psx.c
	Reversed (or previously applied) patch detected!  Skipping patch.
	1 out of 1 hunk ignored -- saving rejects to file psx/psx.c.rej
	patching file tests/exploit.c
	Reversed (or previously applied) patch detected!  Skipping patch.
	2 out of 2 hunks ignored -- saving rejects to file tests/exploit.c.rej
	patching file tests/libcap_launch_test.c
	Reversed (or previously applied) patch detected!  Skipping patch.
	1 out of 1 hunk ignored -- saving rejects to file tests/libcap_launch_test.c.rej
	patching file tests/uns_test.c
	Reversed (or previously applied) patch detected!  Skipping patch.
	1 out of 1 hunk ignored -- saving rejects to file tests/uns_test.c.rej

Problem is because patch was integrated into package repo

Fixes:
http://autobuild.buildroot.net/results/2f619b233e2cfb4d7eeb3cc178c849c74d11f2ca/
Signed-off-by: Illia Bitkov <illia.bitkov@mind.be>
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>