Revert "Fix tcc -run on Windows" (almost)

Oviously what the patch wants is... on Windows, with
"tcc c:/dir/xyz.dll -run file"... pass the absolute
path of the dll to LoadLibrary() which can make sense
in situations.

Other changes in the patch to other platfurms seem to
have no effect. This reverts 52a9a541b0
except 2 lines in tccpe.c.

Also revert _Float16 patch a06c608625
As long as tcc does not really handle _Float16, we can just define
it in tccdefs.h.

Also move uint128_t to tccdefs.h for same reason.

Update github action (might fix random arm64 crashes)

include/tccdefs.h

@@ -125,6 +125,7 @@
     #define __FINITE_MATH_ONLY__ 1
     #define _FORTIFY_SOURCE 0
     //#define __has_builtin(x) 0
+    #define _Float16 short unsigned int /* fake type just for size & alignment (macOS Sequoia) */
 
 #elif defined __ANDROID__
     #define  BIONIC_IOCTL_NO_SIGNEDNESS_OVERLOAD
@@ -141,6 +142,12 @@
 #endif
     #define __INT32_TYPE__ int
 
+#if defined __aarch64__
+    /* GCC's __uint128_t appears in some Linux/OSX header files. Make it a
+       synonym for long double to get the size and alignment right. */
+    #define __uint128_t long double
+#endif
+
 #if !defined _WIN32
     /* glibc defines. We do not support __USER_NAME_PREFIX__ */
     #define __REDIRECT(name, proto, alias) name proto __asm__ (#alias)