Addition of maybequoted() check in fpmkunit.pp is causing utils dir directory to fail due to local fpc.cfg not being recognized and loaded
## Summary
When compiling on MacOS with OPTS='-n @Users/bob/fpc.cfg' the fpc.cfg file is not loaded as a cfg file. Instead it is treated as a file to build. Opt is being passed in as "@/Users/bob/fpc.cfg" due to maybequoted() check in fpmkunit.pp in TBUildEngine.GetCompilerCommand.
raw fpc can take either "@/Users/bob/fpc.cfg" or @/Users/bob/fpc.cfg on the command line but for some reason calling fpc from fpmake with Args containing "@/Users/bob/fpc.cfg" resulst in fpc trying to load a file called ""@/Users/bob/fpc.cfg"" and it will not recognize it as cfg file.
## System Information
<!-- The more information are provided the easier it is to replicate the bug -->
- **Operating system:** MacOS, Ventura 13.1 Xcode 14.3.1<!-- Windows, Linux (if possible, also name the distro), FreeBSD, Android, ... -->
- **Processor architecture:** x86-64<!-- x86, x86-64, ARM, AARCH64, AVR, RISC-V, PowerPC, ... -->
- **Compiler version:** fpc trunk 0bc1d8d <!-- 3.2, 3.2.2, 3.3, trunk, beta, ... (if possible, give also the git hash) -->
- **Device:** <!-- Computer, Tablet, Mobile, Amiga, Microcontroller, ... -->
## Steps to reproduce
<!-- How one can reproduce the issue - this is very important! -->
from base directory run
make all PP=/usr/local/bin/ppcx64-3.2.2 OPT="@/Users/bob/fpc.cfg". Where fpc.cfg looks like:
```
# Location of Compiler Utilities (-FD) and Linker search path prepend (-XR)
#IFDEF DARWIN
-FD/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin
-XR/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk
-Fl/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/usr/lib
#ENDIF
#IFDEF LINUX
#IFDEF CPUARM
#IFDEF CPU32
-XParm-linux-gnueabihf-
#ELSEIF
-XPaarch64-linux-gnu-
#ENDIF
#ENDIF
#ENDIF
-Fu/$FPCDIR$/rtl/units/$fpctarget
-Fu/$FPCDIR$/packages/\*/units/$fpctarget
-Fu/$FPCDIR$/packages/users/src## Example Project
```
<!-- If possible, please create an example project that exhibits the problematic
behavior, and link to it here in the bug report. -->
## What is the current bug behavior?
<!-- What actually happens -->
utils build errors out with ld error message that it cannot find -lc. Forcing -va for the compiler I can see that the fpc.cfg is not loaded but is treated as basic file on the command line. It also has quotes around it.
## What is the expected (correct) behavior?
<!-- What you should see instead -->
compiler, rtl, packages, utils should build
## Relevant logs and/or screenshots
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## Possible fixes
<!-- If you can, link to the line of code that might be responsible for the problem -->
issue