[Bug 222852] archivers/p7zip: armv7 arch needs -fPIC cflags

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=222852

            Bug ID: 222852
           Summary: archivers/p7zip: armv7 arch needs -fPIC cflags
           Product: Ports & Packages
           Version: Latest
          Hardware: arm
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: Individual Port(s)
          Assignee: rakuco at FreeBSD.org
          Reporter: guyyur at gmail.com
                CC: freebsd-arm at FreeBSD.org
             Flags: maintainer-feedback?(rakuco at FreeBSD.org)
          Assignee: rakuco at FreeBSD.org
                CC: freebsd-arm at FreeBSD.org

The newly added armv7 arch needs -fPIC when building p7zip.

Without it, it fails with:
/usr/bin/ld: 7zEncode.o(.text+0x2d04): unresolvable R_ARM_MOVW_ABS_NC
relocation against symbol `_ZTIi@@CXXABI_1.3'
/usr/bin/ld: final link failed: Nonrepresentable section on output
c++: error: linker command failed with exit code 1 (use -v to see invocation)
*** [../../../../bin/7z.so] Error code 1

make[3]: stopped in
/usr/wrkdir/usr/ports/archivers/p7zip/work/p7zip_16.02/CPP/7zip/Bundles/Format7zFree
1 error

Adding the following line to the Makefile resolves the problem
CFLAGS_armv7= -fPIC

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