Make the c90 test pass on Mac and on Windows

On the Mac, the Clang compiler complains about our (required) use of
uint64_t, which is typedef'ed to long long. That type didn't exist in
C90.

On Windows, I forgot the CONFIG += console, resulting in

 error LNK2019: unresolved external symbol _WinMain@16 referenced in function "int __cdecl invoke_main(void)" (?invoke_main@@YAHXZ)

Signed-off-by: Thiago Macieira <thiago.macieira@intel.com>

tests/c90/c90.pro

@@ -1,6 +1,7 @@
-CONFIG += testcase parallel_test
-CONFIG -= qt
+CONFIG += testcase parallel_test console
+CONFIG -= qt app_bundle
 gcc: QMAKE_CFLAGS += -std=c90 -pedantic-errors -Wall -Wextra -Werror
+darwin: QMAKE_CFLAGS += -Wno-long-long
 
 SOURCES += tst_c90.c
 INCLUDEPATH += ../../src