Removing the compiler flag /Oi (Generate Intrinsic Functions) allows
meson to detect functions like memmove, memset correctly. This is
relevant to meson configure for fribidi (see fribidi/meson.build).
This fixes the following "issues" (from fribidi meson-log.txt):
testfile.c(17): error C2168: 'memmove': too few actual parameters for
intrinsic function
Checking for function "memmove" : NO
testfile.c(17): error C2168: 'memset': too few actual parameters for
intrinsic function
Checking for function "memset" : NO
And enables detection of the functions:
Checking for function "memmove" : YES
Checking for function "memset" : YES
