testsuite: Add ABIs to the test matrix; unify tests across ABIs

This eliminates all the *_win32.c tests in favor of the tests they were
branched from, and expands test coverage to run many more tests on
stdcall, thiscall, and fastcall.

This same mechanism also supports testing any other target that has
multiple ABIs.

testsuite/Makefile.am

@@ -20,7 +20,7 @@ CLEANFILES = *.exe core* *.log *.sum
 EXTRA_DIST = config/default.exp libffi.call/cls_19byte.c		\
 libffi.call/cls_align_longdouble_split.c				\
 libffi.call/closure_loc_fn0.c libffi.call/cls_schar.c			\
-libffi.call/closure_fn1.c libffi.call/many2_win32.c			\
+libffi.call/closure_fn1.c \
 libffi.call/return_ul.c libffi.call/cls_align_double.c			\
 libffi.call/return_fl2.c libffi.call/cls_1_1byte.c			\
 libffi.call/cls_64byte.c libffi.call/nested_struct7.c			\
@@ -30,7 +30,7 @@ libffi.call/cls_multi_ushort.c libffi.call/struct3.c			\
 libffi.call/cls_3byte1.c libffi.call/cls_16byte.c			\
 libffi.call/struct8.c libffi.call/nested_struct8.c			\
 libffi.call/cls_multi_sshort.c libffi.call/cls_3byte2.c			\
-libffi.call/fastthis2_win32.c libffi.call/cls_pointer.c			\
+libffi.call/cls_pointer.c			\
 libffi.call/err_bad_typedef.c libffi.call/cls_4_1byte.c			\
 libffi.call/cls_9byte2.c libffi.call/cls_multi_schar.c			\
 libffi.call/stret_medium2.c libffi.call/cls_5_1_byte.c			\
@@ -50,12 +50,12 @@ libffi.call/closure_stdcall.c libffi.call/cls_align_uint16.c		\
 libffi.call/cls_9byte1.c libffi.call/closure_fn6.c			\
 libffi.call/cls_double_va.c libffi.call/cls_align_pointer.c		\
 libffi.call/cls_align_longdouble.c libffi.call/closure_fn2.c		\
-libffi.call/cls_sshort.c libffi.call/many_win32.c			\
+libffi.call/cls_sshort.c \
 libffi.call/nested_struct.c libffi.call/cls_20byte.c			\
 libffi.call/cls_longdouble.c libffi.call/cls_multi_uchar.c		\
 libffi.call/return_uc.c libffi.call/closure_thiscall.c			\
 libffi.call/cls_18byte.c libffi.call/cls_8byte.c			\
-libffi.call/promotion.c libffi.call/struct1_win32.c			\
+libffi.call/promotion.c \
 libffi.call/return_dbl.c libffi.call/cls_24byte.c			\
 libffi.call/struct4.c libffi.call/cls_6byte.c				\
 libffi.call/cls_align_uint32.c libffi.call/float.c			\
@@ -63,7 +63,7 @@ libffi.call/float1.c libffi.call/float_va.c libffi.call/negint.c	\
 libffi.call/return_dbl1.c libffi.call/cls_3_1byte.c			\
 libffi.call/cls_align_float.c libffi.call/return_fl1.c			\
 libffi.call/nested_struct10.c libffi.call/nested_struct5.c		\
-libffi.call/fastthis1_win32.c libffi.call/cls_align_sint64.c		\
+libffi.call/cls_align_sint64.c		\
 libffi.call/stret_large2.c libffi.call/return_sl.c			\
 libffi.call/closure_fn0.c libffi.call/cls_5byte.c			\
 libffi.call/cls_2byte.c libffi.call/float2.c				\
@@ -75,13 +75,13 @@ libffi.call/cls_float.c libffi.call/cls_pointer_stack.c		\
 libffi.call/pyobjc-tc.c libffi.call/cls_multi_ushortchar.c		\
 libffi.call/struct1.c libffi.call/nested_struct9.c			\
 libffi.call/huge_struct.c libffi.call/problem1.c			\
-libffi.call/float4.c libffi.call/fastthis3_win32.c			\
-libffi.call/return_ldl.c libffi.call/strlen2_win32.c			\
-libffi.call/closure_fn5.c libffi.call/struct2_win32.c			\
+libffi.call/float4.c \
+libffi.call/return_ldl.c \
+libffi.call/closure_fn5.c \
 libffi.call/struct6.c libffi.call/return_ll.c libffi.call/struct9.c	\
 libffi.call/return_sc.c libffi.call/struct7.c				\
 libffi.call/cls_align_uint64.c libffi.call/cls_4byte.c			\
-libffi.call/strlen_win32.c libffi.call/cls_6_1_byte.c			\
+libffi.call/cls_6_1_byte.c			\
 libffi.call/cls_7_1_byte.c libffi.call/unwindtest.cc			\
 libffi.call/unwindtest_ffi_call.cc	\
 lib/wrapper.exp lib/target-libpath.exp	\
@@ -90,5 +90,7 @@ libffi.call/cls_uchar_va.c libffi.call/cls_uint_va.c			\
 libffi.call/cls_ulong_va.c libffi.call/cls_ushort_va.c			\
 libffi.call/nested_struct11.c libffi.call/uninitialized.c		\
 libffi.call/va_1.c libffi.call/va_struct1.c libffi.call/va_struct2.c	\
-libffi.call/va_struct3.c
-
+libffi.call/va_struct3.c \
+libffi.call/strlen2.c \
+libffi.call/strlen3.c \
+libffi.call/strlen4.c