!59 [sync] PR-58: Support build with clang

From: @openeuler-sync-bot 
Reviewed-by: @HuaxinLuGitee 
Signed-off-by: @HuaxinLuGitee

libcap.spec

@@ -1,6 +1,6 @@
 Name:     libcap
 Version:  2.69
-Release:  1
+Release:  2
 Summary:  A library for getting and setting POSIX.1e draft 15 capabilities        
 License:  GPLv2
 URL:      https://sites.google.com/site/fullycapable
@@ -8,6 +8,7 @@ Source0:  https://www.kernel.org/pub/linux/libs/security/linux-privs/libcap2/%{n
 
 Patch0:   libcap-buildflags.patch
 Patch1:   backport-libcap-Ensure-the-XATTR_NAME_CAPS-is-define.patch 
+Patch2:   support-specify-cc.patch
 
 BuildRequires: libattr-devel pam-devel perl-interpreter gcc
 
@@ -70,6 +71,9 @@ chmod +x %{buildroot}/%{_libdir}/*.so.*
 %{_mandir}/man8/*.gz
 
 %changelog
+* Sun Apr 16 2023 jammyjellyfish <jammyjellyfish255@outlook.com> - 2.69-2
+- Support specify CC
+
 * Thu Jul 20 2023 wangyunjia <yunjia.wang@huawei.com> - 2.69-1
 - update version to 2.69
 

support-specify-cc.patch

@@ -0,0 +1,12 @@
+diff -up libcap-2.66/Make.Rules.orig2 libcap-2.66/Make.Rules
+--- libcap-2.66/Make.Rules.orig2	2023-04-16 17:46:55.922279005 +0800
++++ libcap-2.66/Make.Rules	2023-04-16 17:46:13.518097014 +0800
+@@ -66,7 +66,7 @@ DEFINES := -D_LARGEFILE64_SOURCE -D_FILE
+ SYSTEM_HEADERS = /usr/include
+ 
+ SUDO := sudo
+-CC := $(CROSS_COMPILE)gcc
++CC ?= $(CROSS_COMPILE)gcc
+ LD := $(CC) -Wl,-x -shared
+ AR := $(CROSS_COMPILE)ar
+ RANLIB := $(CROSS_COMPILE)ranlib