fails compilation on MSVC

[neheb]

[1/2] "cl" "-Isubprojects\CException-1.3.3\lib\libcexception.a.p" "-Isubprojects\CException-1.3.3\lib" "-I..\subprojects\CException-1.3.3\lib" "/MDd" "/nologo" "/showIncludes" "/utf-8" "/W2" "/WX" "/Od" "/Zi" "/Fdsubprojects\CException-1.3.3\lib\libcexception.a.p\CException.c.pdb" /Fosubprojects/CException-1.3.3/lib/libcexception.a.p/CException.c.obj "/c" ../subprojects/CException-1.3.3/lib/CException.c
FAILED: subprojects/CException-1.3.3/lib/libcexception.a.p/CException.c.obj 
"cl" "-Isubprojects\CException-1.3.3\lib\libcexception.a.p" "-Isubprojects\CException-1.3.3\lib" "-I..\subprojects\CException-1.3.3\lib" "/MDd" "/nologo" "/showIncludes" "/utf-8" "/W2" "/WX" "/Od" "/Zi" "/Fdsubprojects\CException-1.3.3\lib\libcexception.a.p\CException.c.pdb" /Fosubprojects/CException-1.3.3/lib/libcexception.a.p/CException.c.obj "/c" ../subprojects/CException-1.3.3/lib/CException.c
../subprojects/CException-1.3.3/lib/CException.c(3): error C2220: the following warning is treated as an error
../subprojects/CException-1.3.3/lib/CException.c(3): warning C4068: unknown pragma 'GCC'
../subprojects/CException-1.3.3/lib/CException.c(4): warning C4068: unknown pragma 'GCC'
../subprojects/CException-1.3.3/lib/CException.c(6): warning C4068: unknown pragma 'GCC'
ninja: build stopped: subcommand failed.