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arm: define PIC if the compiler uses pic by default

Necessary for the way fedora enables `-fPIE` by default for package
builds. Fixes #221.

--- a/meson.build

+++ b/meson.build

@@ -230,6 +230,23 @@

 '''

     have_as_func = cc.compiles(as_func_code)

     cdata.set10('HAVE_AS_FUNC', have_as_func)

+

+    # fedora package build infrastructure uses a gcc specs file to enable

+    # '-fPIE' by default. The chosen way only adds '-fPIE' to the C compiler

+    # with integrated preprocessor. It is not added to the standalone

+    # preprocessor or the preprocessing stage of '.S' files. So we have to

+    # compile code to check if we have to define PIC for the arm asm to

+    # avoid absolute relocations when building for example checkasm.

+    check_pic_code = '''

+#if defined(PIC)

+#error "PIC already defined"

+#elif !(defined(__PIC__) || defined(__pic__))

+#error "no pic"

+#endif

+'''

+    if cc.compiles(check_pic_code)

+        cdata.set('PIC', '3')

+    endif

 endif

 if host_machine.cpu_family().startswith('x86')